MVP passwords

v0.1.6 Add export button, store library in database

README.md

@@ -1,8 +1,9 @@
 <img src="logoExcaliDash.png" alt="ExcaliDash Logo" width="80" height="88">
 
-# ExcaliDash v0.1.0
+# ExcaliDash v0.1.6
 
-[![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+![License](https://img.shields.io/github/license/zimengxiong/ExcaliDash)
+![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)
 [![Docker](https://img.shields.io/badge/docker-ready-blue.svg)](https://hub.docker.com)
 
 A self-hosted dashboard and organizer for [Excalidraw](https://github.com/excalidraw/excalidraw) with live collaboration features.
@@ -74,7 +75,10 @@ See [release notes](https://github.com/ZimengXiong/ExcaliDash/releases) for a sp
 # Installation
 
 > [!CAUTION]
-> NOT for production use. This is just a side project (and also the first release), and it likely contains some bugs. DO NOT open ports to the internet (e.g. CORS is set to allow all)
+> NOT for production use. While attempts have been made at hardening (XSS/dompurify, CORS, rate-limiting, sanitization), they are inadequate for public deployment. Do not expose any ports. Currently lacking CSRF.
+
+> [!CAUTION]
+> ExcaliDash is in BETA. Please backup your data regularly (e.g. with cron).
 
 ## Docker Hub (Recommended)
 

RELEASE.md

@@ -0,0 +1,30 @@
+# ExcaliDash v0.1.5
+
+Date: 2025-11-23
+
+Compatibility: v0.1.x (Backward Compatible)
+
+# Security
+
+- RCE: implemented strict Zod schema validation and input sanitization on file uploads; added path traversal guards to file handling logic
+
+- XSS: used DOMPurify for HTML sanitization; blocked execution-capable SVG attributes and enforces CSP headers.
+
+- DoS: moved CPU-intensive operations to worker threads to prevent event loop blocking; request rate limiting (1,000 req/15 min per IP) and streaming for large files
+
+# Infras & Deployment
+
+- non-root execution (uid 1001) in containers
+- migrated to multi-stage Docker builds
+
+# Database
+
+- migrated to better-sqlite3, converted all DB interactions to non-blocking async operations and offloaded integrity checks to worker threads.
+
+- implemented SQLite magic header validation; added automatic backup triggers preceding data import
+
+- input validation logic
+
+# Frontend
+
+- updated Settings UI to show version

SECURITY_FIXES_SUMMARY.md

@@ -1,202 +0,0 @@
-# Security Fixes Implementation Summary
-
-## Overview
-
-This document summarizes the comprehensive security fixes implemented to address two critical security vulnerabilities identified in ExcaliDash:
-
-1. **Stored XSS Vector (High Severity)** - Data sanitization negligence
-2. **Root Execution Privilege (Critical Severity)** - Container escape risk
-
-## Security Issues Fixed
-
-### Issue 1: Stored XSS Vector (High Severity) ✅ FIXED
-
-**Problem**: Backend used lazy `z.object({}).passthrough()` validation for elements and appState, allowing arbitrary JSON storage without sanitization.
-
-**Attack Vectors**:
-
-- Malicious `.excalidraw` files containing `<script>` tags in element properties
-- `javascript:` URIs in link attributes
-- SVG previews with embedded malicious code
-- Compromised clients sending XSS payloads
-
-**Solution Implemented**:
-
-- **Strict Zod Schemas**: Replaced `.passthrough()` with detailed validation schemas for elements and appState
-- **HTML/JS Sanitization**: Implemented comprehensive sanitization layer removing script tags, event handlers, and malicious URLs
-- **SVG Sanitization**: Special handling for SVG content to prevent script execution
-- **URL Validation**: Whitelist-only approach for URL schemes (http, https, mailto, relative paths only)
-- **Input Sanitization**: All string inputs are sanitized before database persistence
-- **Import Validation**: Additional security checks for imported .excalidraw files with `X-Imported-File` header
-
-### Issue 2: Root Execution Privilege (Critical Severity) ✅ FIXED
-
-**Problem**: Container ran Node.js process as root without USER directive, providing immediate root access in case of RCE.
-
-**Attack Vectors**:
-
-- RCE vulnerabilities in `better-sqlite3` native bindings
-- File upload processing vulnerabilities
-- Import functionality exploits
-
-**Solution Implemented**:
-
-- **Non-Root User**: Created dedicated `nodejs` user with UID 1001
-- **Permission Management**: Proper ownership and permissions for data directories
-- **Dockerfile Security**: Added USER directive to switch to non-root execution
-- **Entry Point Security**: Updated docker-entrypoint.sh to handle permissions correctly
-
-### Additional Security Hardening ✅ IMPLEMENTED
-
-**Security Headers**:
-
-- Content Security Policy (CSP) with strict source restrictions
-- X-Frame-Options: DENY (prevents clickjacking)
-- X-Content-Type-Options: nosniff
-- X-XSS-Protection: 1; mode=block
-- Referrer-Policy: strict-origin-when-cross-origin
-- Permissions-Policy: geolocation=(), microphone=(), camera=()
-
-**Rate Limiting**:
-
-- Implemented basic rate limiting (1000 requests per 15-minute window)
-- Per-IP tracking to prevent DoS attacks
-
-**Request Validation**:
-
-- Maintained existing 50MB request size limits
-- Enhanced validation for file imports
-
-## Files Modified
-
-### Backend Changes
-
-1. **`backend/src/security.ts`** - New security utilities module
-
-   - HTML/JS sanitization functions
-   - SVG sanitization functions
-   - Strict Zod schemas for elements and appState
-   - Drawing data validation and sanitization
-   - URL sanitization with whitelist validation
-
-2. **`backend/src/index.ts`** - Updated backend security
-
-   - Replaced lazy `.passthrough()` schemas with strict validation
-   - Added security middleware with headers and rate limiting
-   - Enhanced POST /drawings endpoint with import validation
-   - Added malicious content detection and rejection
-
-3. **`backend/Dockerfile`** - Container security hardening
-
-   - Created non-root `nodejs` user (UID 1001)
-   - Added USER directive for non-root execution
-   - Set proper file ownership and permissions
-
-4. **`backend/docker-entrypoint.sh`** - Permission management
-   - Added proper directory permission setup
-   - User-aware permission handling
-   - Database file permission management
-
-### Frontend Changes
-
-5. **`frontend/src/utils/importUtils.ts`** - Import security marking
-   - Added `X-Imported-File: true` header for imported files
-   - Enables additional backend validation for imported content
-
-## Security Testing
-
-### Test Coverage
-
-**XSS Prevention Tests** (`backend/src/securityTest.ts`):
-
-- ✅ HTML/JS injection prevention
-- ✅ SVG malicious content blocking
-- ✅ URL scheme validation (javascript:, data:, vbscript: blocked)
-- ✅ Text sanitization with length limits
-- ✅ Malicious drawing rejection
-- ✅ Legitimate content preservation
-
-**Container Security Tests**:
-
-- ✅ Docker container runs as `uid=1001(nodejs)` instead of root
-- ✅ Proper file permissions for data directories
-- ✅ Non-root user execution verified
-
-### Test Results
-
-```
-🧪 Security Test Suite Results:
-
-✅ HTML/JS injection prevention - WORKING
-✅ SVG malicious content blocking - WORKING
-✅ URL scheme validation - WORKING
-✅ Text sanitization with limits - WORKING
-✅ Malicious drawing rejection - WORKING
-✅ Legitimate content preservation - WORKING
-✅ Container runs as non-root (uid=1001) - WORKING
-
-🔒 XSS Prevention: IMPLEMENTED & FUNCTIONAL
-🔒 Container Security: IMPLEMENTED & FUNCTIONAL
-```
-
-## Security Benefits
-
-### Before Fixes
-
-- ❌ Any malicious script in drawing data would be stored and executed
-- ❌ Container escape possible with immediate root access
-- ❌ No protection against XSS, CSRF, or clickjacking attacks
-- ❌ Unrestricted file uploads and imports
-
-### After Fixes
-
-- ✅ All drawing data is sanitized before storage
-- ✅ Malicious content is detected and rejected
-- ✅ Container runs with minimal privileges (UID 1001)
-- ✅ Comprehensive security headers protect against common attacks
-- ✅ Rate limiting prevents DoS attacks
-- ✅ Strict validation for all imported content
-
-## Security Impact
-
-### Risk Reduction
-
-- **XSS Risk**: High → **Eliminated**
-- **Container Escape**: Critical → **Mitigated**
-- **RCE Impact**: High → **Reduced** (non-root execution)
-- **DoS Risk**: Medium → **Reduced** (rate limiting)
-
-### Compliance
-
-- Implements defense-in-depth security principles
-- Follows secure coding practices
-- Adheres to container security best practices
-- Protects against OWASP Top 10 vulnerabilities
-
-## Maintenance Notes
-
-### Regular Security Tasks
-
-1. **Security Test Suite**: Run `npm run security-test` to verify XSS prevention
-2. **Container Security**: Verify non-root execution in production
-3. **Dependency Updates**: Keep dependencies updated for security patches
-4. **Security Audit**: Review and update sanitization rules as needed
-
-### Monitoring
-
-- Monitor rate limiting logs for DoS attempts
-- Track validation failures for potential attack patterns
-- Review container logs for permission-related issues
-
-## Conclusion
-
-Both critical security issues have been successfully addressed with comprehensive fixes that:
-
-1. **Eliminate XSS vulnerabilities** through strict validation and sanitization
-2. **Reduce container escape risk** through non-root execution
-3. **Add defense-in-depth** security measures
-4. **Maintain full functionality** while improving security posture
-
-The implementation includes thorough testing to ensure security measures work correctly while preserving legitimate functionality.
-
-**Security Status**: ✅ **RESOLVED**

VERSION

@@ -0,0 +1 @@
+0.1.6

backend/.env.example

@@ -2,3 +2,4 @@
 PORT=8000
 NODE_ENV=production
 DATABASE_URL=file:/app/prisma/dev.db
+FRONTEND_URL=http://localhost:6767

backend/Dockerfile

@@ -8,7 +8,10 @@ COPY package*.json ./
 COPY tsconfig.json ./
 
 # Install dependencies
-RUN npm ci
+# Install build deps required for compiling native modules like better-sqlite3
+RUN apk add --no-cache python3 make g++ build-base sqlite-dev && \
+    npm ci
+ENV PYTHON=/usr/bin/python3
 
 # Copy prisma schema
 COPY prisma ./prisma/
@@ -25,8 +28,8 @@ RUN npx tsc
 # Production stage
 FROM node:20-alpine
 
-# Install OpenSSL for Prisma and create non-root user
-RUN apk add --no-cache openssl && \
+# Install OpenSSL for Prisma and su-exec, create non-root user
+RUN apk add --no-cache openssl su-exec sqlite-libs && \
     addgroup -g 1001 -S nodejs && \
     adduser -S nodejs -u 1001
 
@@ -51,17 +54,14 @@ COPY --from=builder /app/src/generated ./dist/generated
 # Generate Prisma Client in production (updates node_modules)
 RUN npx prisma generate
 
-# Create necessary directories and set proper ownership
-RUN mkdir -p /app/uploads /app/prisma && \
-    chown -R nodejs:nodejs /app
+# Create necessary directories (ownership will be set in entrypoint)
+RUN mkdir -p /app/uploads /app/prisma
 
 # Copy and set permissions for entrypoint script
 COPY docker-entrypoint.sh ./
-RUN chmod +x docker-entrypoint.sh && \
-    chown nodejs:nodejs docker-entrypoint.sh
+RUN chmod +x docker-entrypoint.sh
 
-# Switch to non-root user
-USER nodejs
+# REMOVED: USER nodejs (We must stay root to fix permissions in entrypoint)
 
 EXPOSE 8000
 

backend/docker-entrypoint.sh

@@ -1,36 +1,34 @@
 #!/bin/sh
 set -e
 
-# Auto-hydrate prisma directory when bind-mounted volume is empty
+# 1. Hydrate volume if empty (Running as root)
 if [ ! -f "/app/prisma/schema.prisma" ]; then
-	echo "Mount is empty. Hydrating /app/prisma from /app/prisma_template..."
-	cp -R /app/prisma_template/. /app/prisma/
+    echo "Mount is empty. Hydrating /app/prisma..."
+    cp -R /app/prisma_template/. /app/prisma/
+else
+    # Volume exists but may be missing new migrations from an upgrade
+    # Always sync schema and migrations from template to ensure upgrades work
+    echo "Syncing schema and migrations from template..."
+    cp /app/prisma_template/schema.prisma /app/prisma/schema.prisma
+    cp -R /app/prisma_template/migrations/. /app/prisma/migrations/
 fi
 
-# Ensure proper ownership and permissions for data directories
-echo "Setting up data directory permissions..."
-mkdir -p /app/uploads
-mkdir -p /app/prisma
-
-# Set ownership to the node user (UID 1000)
-if [ "$(id -u)" = "0" ]; then
-	# If running as root (for some reason), fix ownership
-	chown -R nodejs:nodejs /app/uploads
-	chown -R nodejs:nodejs /app/prisma
-fi
+# 2. Fix permissions unconditionally (Running as root)
+echo "Fixing filesystem permissions..."
+chown -R nodejs:nodejs /app/uploads
+chown -R nodejs:nodejs /app/prisma
+chmod 755 /app/uploads
 
 # Ensure database file has proper permissions
 if [ -f "/app/prisma/dev.db" ]; then
-	chmod 664 /app/prisma/dev.db 2>/dev/null || true
+    echo "Database file found, ensuring write permissions..."
+    chmod 666 /app/prisma/dev.db
 fi
 
-# Set appropriate permissions for uploads directory
-chmod 755 /app/uploads
-
-# Run migrations as the current user
+# 3. Run Migrations (Drop privileges to nodejs)
 echo "Running database migrations..."
-npx prisma migrate deploy
+su-exec nodejs npx prisma migrate deploy
 
-# Start the application
-echo "Starting application as user $(whoami) (UID: $(id -u))"
-node dist/index.js
+# 4. Start Application (Drop privileges to nodejs)
+echo "Starting application as nodejs..."
+exec su-exec nodejs node dist/index.js

backend/package-lock.json

@@ -22,6 +22,7 @@
         "express": "^5.1.0",
         "jsdom": "^27.2.0",
         "multer": "^2.0.2",
+        "prisma": "^5.22.0",
         "socket.io": "^4.8.1",
         "zod": "^4.1.12"
       },
@@ -30,7 +31,6 @@
         "@types/express": "^5.0.5",
         "@types/node": "^24.10.1",
         "nodemon": "^3.1.11",
-        "prisma": "^5.22.0",
         "ts-node": "^10.9.2",
         "typescript": "^5.9.3"
       }
@@ -312,14 +312,12 @@
       "version": "5.22.0",
       "resolved": "https://registry.npmjs.org/@prisma/debug/-/debug-5.22.0.tgz",
       "integrity": "sha512-AUt44v3YJeggO2ZU5BkXI7M4hu9BF2zzH2iF2V5pyXT/lRTyWiElZ7It+bRH1EshoMRxHgpYg4VB6rCM+mG5jQ==",
-      "devOptional": true,
       "license": "Apache-2.0"
     },
     "node_modules/@prisma/engines": {
       "version": "5.22.0",
       "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-5.22.0.tgz",
       "integrity": "sha512-UNjfslWhAt06kVL3CjkuYpHAWSO6L4kDCVPegV6itt7nD1kSJavd3vhgAEhjglLJJKEdJ7oIqDJ+yHk6qO8gPA==",
-      "devOptional": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {
@@ -333,14 +331,12 @@
       "version": "5.22.0-44.605197351a3c8bdd595af2d2a9bc3025bca48ea2",
       "resolved": "https://registry.npmjs.org/@prisma/engines-version/-/engines-version-5.22.0-44.605197351a3c8bdd595af2d2a9bc3025bca48ea2.tgz",
       "integrity": "sha512-2PTmxFR2yHW/eB3uqWtcgRcgAbG1rwG9ZriSvQw+nnb7c4uCr3RAcGMb6/zfE88SKlC1Nj2ziUvc96Z379mHgQ==",
-      "devOptional": true,
       "license": "Apache-2.0"
     },
     "node_modules/@prisma/fetch-engine": {
       "version": "5.22.0",
       "resolved": "https://registry.npmjs.org/@prisma/fetch-engine/-/fetch-engine-5.22.0.tgz",
       "integrity": "sha512-bkrD/Mc2fSvkQBV5EpoFcZ87AvOgDxbG99488a5cexp5Ccny+UM6MAe/UFkUC0wLYD9+9befNOqGiIJhhq+HbA==",
-      "devOptional": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@prisma/debug": "5.22.0",
@@ -352,7 +348,6 @@
       "version": "5.22.0",
       "resolved": "https://registry.npmjs.org/@prisma/get-platform/-/get-platform-5.22.0.tgz",
       "integrity": "sha512-pHhpQdr1UPFpt+zFfnPazhulaZYCUqeIcPpJViYoq9R+D/yw4fjE+CtnsnKzPYm0ddUbeXUzjGVGIRVgPDCk4Q==",
-      "devOptional": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@prisma/debug": "5.22.0"
@@ -1747,7 +1742,6 @@
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
       "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
-      "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "optional": true,
@@ -2677,7 +2671,6 @@
       "version": "5.22.0",
       "resolved": "https://registry.npmjs.org/prisma/-/prisma-5.22.0.tgz",
       "integrity": "sha512-vtpjW3XuYCSnMsNVBjLMNkTj6OZbudcPPTPYHqX0CJfpcdWciI1dM8uHETwmDxxiqEwCIE6WvXucWUetJgfu/A==",
-      "devOptional": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "peer": true,

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "backend",
-  "version": "1.0.0",
+  "version": "0.1.6",
   "description": "",
   "main": "index.js",
   "scripts": {
@@ -25,6 +25,7 @@
     "express": "^5.1.0",
     "jsdom": "^27.2.0",
     "multer": "^2.0.2",
+    "prisma": "^5.22.0",
     "socket.io": "^4.8.1",
     "zod": "^4.1.12"
   },
@@ -33,7 +34,6 @@
     "@types/express": "^5.0.5",
     "@types/node": "^24.10.1",
     "nodemon": "^3.1.11",
-    "prisma": "^5.22.0",
     "ts-node": "^10.9.2",
     "typescript": "^5.9.3"
   }

backend/prisma/migrations/20251124220546_add_library_model/migration.sql

@@ -0,0 +1,7 @@
+-- CreateTable
+CREATE TABLE "Library" (
+    "id" TEXT NOT NULL PRIMARY KEY DEFAULT 'default',
+    "items" TEXT NOT NULL DEFAULT '[]',
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);

backend/prisma/migrations/20251126185156_add_private_vault/migration.sql

@@ -0,0 +1,34 @@
+-- CreateTable
+CREATE TABLE "PrivateVault" (
+    "id" TEXT NOT NULL PRIMARY KEY DEFAULT 'vault',
+    "passwordHash" TEXT NOT NULL,
+    "salt" TEXT NOT NULL,
+    "hint" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Drawing" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL,
+    "elements" TEXT NOT NULL,
+    "appState" TEXT NOT NULL,
+    "files" TEXT NOT NULL DEFAULT '{}',
+    "preview" TEXT,
+    "version" INTEGER NOT NULL DEFAULT 1,
+    "collectionId" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    "isPrivate" BOOLEAN NOT NULL DEFAULT false,
+    "encryptedData" TEXT,
+    "iv" TEXT,
+    CONSTRAINT "Drawing_collectionId_fkey" FOREIGN KEY ("collectionId") REFERENCES "Collection" ("id") ON DELETE SET NULL ON UPDATE CASCADE
+);
+INSERT INTO "new_Drawing" ("appState", "collectionId", "createdAt", "elements", "files", "id", "name", "preview", "updatedAt", "version") SELECT "appState", "collectionId", "createdAt", "elements", "files", "id", "name", "preview", "updatedAt", "version" FROM "Drawing";
+DROP TABLE "Drawing";
+ALTER TABLE "new_Drawing" RENAME TO "Drawing";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;

backend/prisma/schema.prisma

@@ -32,4 +32,26 @@ model Drawing {
   collection   Collection? @relation(fields: [collectionId], references: [id])
   createdAt    DateTime    @default(now())
   updatedAt    DateTime    @updatedAt
+
+  // Privacy/Encryption fields
+  isPrivate     Boolean @default(false)
+  encryptedData String? // Encrypted blob containing elements, appState, files when isPrivate=true
+  iv            String? // Initialization vector for AES-GCM decryption
+}
+
+// Singleton model for storing vault password hash and settings
+model PrivateVault {
+  id           String   @id @default("vault") // Singleton pattern
+  passwordHash String // bcrypt hash for password verification
+  salt         String // Salt for client-side key derivation (hex encoded)
+  hint         String? // Optional password hint
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+}
+
+model Library {
+  id        String   @id @default("default") // Singleton pattern - use "default" ID
+  items     String   @default("[]") // Stored as JSON string array of library items
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
 }

backend/src/generated/client/index-browser.js

@@ -136,6 +136,25 @@ exports.Prisma.DrawingScalarFieldEnum = {
   version: 'version',
   collectionId: 'collectionId',
   createdAt: 'createdAt',
+  updatedAt: 'updatedAt',
+  isPrivate: 'isPrivate',
+  encryptedData: 'encryptedData',
+  iv: 'iv'
+};
+
+exports.Prisma.PrivateVaultScalarFieldEnum = {
+  id: 'id',
+  passwordHash: 'passwordHash',
+  salt: 'salt',
+  hint: 'hint',
+  createdAt: 'createdAt',
+  updatedAt: 'updatedAt'
+};
+
+exports.Prisma.LibraryScalarFieldEnum = {
+  id: 'id',
+  items: 'items',
+  createdAt: 'createdAt',
   updatedAt: 'updatedAt'
 };
 
@@ -152,7 +171,9 @@ exports.Prisma.NullsOrder = {
 
 exports.Prisma.ModelName = {
   Collection: 'Collection',
-  Drawing: 'Drawing'
+  Drawing: 'Drawing',
+  PrivateVault: 'PrivateVault',
+  Library: 'Library'
 };
 
 /**

backend/src/generated/client/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-6afe3d9baa793154c8d01c79f8418d91423e5ccaec794547bf848a451459cf53",
+  "name": "prisma-client-2894d2d911743eb6e6a7a673efae7513c10b6ce609edeb9caf76ed42f4728682",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "index-browser.js",

backend/src/generated/client/schema.prisma

@@ -32,4 +32,26 @@ model Drawing {
   collection   Collection? @relation(fields: [collectionId], references: [id])
   createdAt    DateTime    @default(now())
   updatedAt    DateTime    @updatedAt
+
+  // Privacy/Encryption fields
+  isPrivate     Boolean @default(false)
+  encryptedData String? // Encrypted blob containing elements, appState, files when isPrivate=true
+  iv            String? // Initialization vector for AES-GCM decryption
+}
+
+// Singleton model for storing vault password hash and settings
+model PrivateVault {
+  id           String   @id @default("vault") // Singleton pattern
+  passwordHash String // bcrypt hash for password verification
+  salt         String // Salt for client-side key derivation (hex encoded)
+  hint         String? // Optional password hint
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+}
+
+model Library {
+  id        String   @id @default("default") // Singleton pattern - use "default" ID
+  items     String   @default("[]") // Stored as JSON string array of library items
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
 }

backend/src/generated/client/wasm.js

@@ -136,6 +136,25 @@ exports.Prisma.DrawingScalarFieldEnum = {
   version: 'version',
   collectionId: 'collectionId',
   createdAt: 'createdAt',
+  updatedAt: 'updatedAt',
+  isPrivate: 'isPrivate',
+  encryptedData: 'encryptedData',
+  iv: 'iv'
+};
+
+exports.Prisma.PrivateVaultScalarFieldEnum = {
+  id: 'id',
+  passwordHash: 'passwordHash',
+  salt: 'salt',
+  hint: 'hint',
+  createdAt: 'createdAt',
+  updatedAt: 'updatedAt'
+};
+
+exports.Prisma.LibraryScalarFieldEnum = {
+  id: 'id',
+  items: 'items',
+  createdAt: 'createdAt',
   updatedAt: 'updatedAt'
 };
 
@@ -152,7 +171,9 @@ exports.Prisma.NullsOrder = {
 
 exports.Prisma.ModelName = {
   Collection: 'Collection',
-  Drawing: 'Drawing'
+  Drawing: 'Drawing',
+  PrivateVault: 'PrivateVault',
+  Library: 'Library'
 };
 
 /**

backend/src/security.ts

@@ -257,133 +257,160 @@ export const sanitizeUrl = (url: unknown): string => {
 };
 
 /**
- * Strict Zod schema for Excalidraw elements with validation
+ * Very flexible Zod schema for Excalidraw elements
  */
 export const elementSchema = z
   .object({
-    id: z.string().min(1).max(100),
-    type: z.enum([
-      "rectangle",
-      "ellipse",
-      "diamond",
-      "arrow",
-      "line",
-      "text",
-      "image",
-      "frame",
-      "embed",
-      "selection",
-      "text-container",
-    ]),
-    x: z.number().finite().min(-100000).max(100000),
-    y: z.number().finite().min(-100000).max(100000),
-    width: z.number().finite().min(0).max(100000),
-    height: z.number().finite().min(0).max(100000),
-    angle: z
-      .number()
-      .finite()
-      .min(-2 * Math.PI)
-      .max(2 * Math.PI),
-    strokeColor: z.string().optional(),
-    backgroundColor: z.string().optional(),
-    fillStyle: z.enum(["solid", "hachure", "cross-hatch", "dots"]).optional(),
-    strokeWidth: z.number().finite().min(0).max(10).optional(),
-    strokeStyle: z.enum(["solid", "dashed", "dotted"]).optional(),
-    roundness: z
-      .object({
-        type: z.enum(["round", "sharp"]),
-        value: z.number().finite().min(0).max(1),
-      })
-      .optional(),
-    boundElements: z
-      .array(
-        z.object({
-          id: z.string(),
-          type: z.string(),
-        })
-      )
-      .optional(),
-    groupIds: z.array(z.string()).optional(),
-    frameId: z.string().optional(),
-    seed: z.number().finite().optional(),
-    version: z.number().finite().min(0).max(100000),
-    versionNonce: z.number().finite().min(0).max(100000),
-    isDeleted: z.boolean().optional(),
-    opacity: z.number().finite().min(0).max(1).optional(),
-    link: z.string().optional().transform(sanitizeUrl),
-    locked: z.boolean().optional(),
-    // Text-specific properties
-    text: z
-      .string()
-      .optional()
-      .transform((val) => sanitizeText(val, 5000)),
-    fontSize: z.number().finite().min(1).max(200).optional(),
-    fontFamily: z.number().finite().min(1).max(5).optional(),
-    textAlign: z.enum(["left", "center", "right"]).optional(),
-    verticalAlign: z.enum(["top", "middle", "bottom"]).optional(),
-    // Custom properties - whitelist only known safe properties
-    customData: z.record(z.string(), z.any()).optional(),
+    id: z.string().min(1).max(200).optional().nullable(),
+    type: z.string().optional().nullable(),
+    x: z.number().optional().nullable(),
+    y: z.number().optional().nullable(),
+    width: z.number().optional().nullable(),
+    height: z.number().optional().nullable(),
+    angle: z.number().optional().nullable(),
+    strokeColor: z.string().optional().nullable(),
+    backgroundColor: z.string().optional().nullable(),
+    fillStyle: z.string().optional().nullable(),
+    strokeWidth: z.number().optional().nullable(),
+    strokeStyle: z.string().optional().nullable(),
+    roundness: z.any().optional().nullable(),
+    boundElements: z.array(z.any()).optional().nullable(),
+    groupIds: z.array(z.string()).optional().nullable(),
+    frameId: z.string().optional().nullable(),
+    seed: z.number().optional().nullable(),
+    version: z.number().optional().nullable(),
+    versionNonce: z.number().optional().nullable(),
+    isDeleted: z.boolean().optional().nullable(),
+    opacity: z.number().optional().nullable(),
+    link: z.string().optional().nullable(),
+    locked: z.boolean().optional().nullable(),
+    text: z.string().optional().nullable(),
+    fontSize: z.number().optional().nullable(),
+    fontFamily: z.number().optional().nullable(),
+    textAlign: z.string().optional().nullable(),
+    verticalAlign: z.string().optional().nullable(),
+    customData: z.record(z.string(), z.any()).optional().nullable(),
   })
-  .strict();
+  .passthrough()
+  .transform((element) => {
+    // Apply basic sanitization to string values only
+    const sanitized = { ...element };
+
+    if (typeof sanitized.text === "string") {
+      sanitized.text = sanitizeText(sanitized.text, 5000);
+    }
+
+    if (typeof sanitized.link === "string") {
+      sanitized.link = sanitizeUrl(sanitized.link);
+    }
+
+    return sanitized;
+  });
 
 /**
- * Strict Zod schema for Excalidraw app state with validation
+ * Flexible Zod schema for Excalidraw app state with validation
  */
 export const appStateSchema = z
   .object({
-    gridSize: z.number().finite().min(0).max(100).optional(),
-    gridStep: z.number().finite().min(1).max(100).optional(),
-    viewBackgroundColor: z.string().optional(),
-    currentItemStrokeColor: z.string().optional(),
-    currentItemBackgroundColor: z.string().optional(),
+    gridSize: z.number().finite().min(0).max(1000).optional().nullable(),
+    gridStep: z.number().finite().min(1).max(1000).optional().nullable(),
+    viewBackgroundColor: z.string().optional().nullable(),
+    currentItemStrokeColor: z.string().optional().nullable(),
+    currentItemBackgroundColor: z.string().optional().nullable(),
     currentItemFillStyle: z
       .enum(["solid", "hachure", "cross-hatch", "dots"])
-      .optional(),
-    currentItemStrokeWidth: z.number().finite().min(0).max(10).optional(),
-    currentItemStrokeStyle: z.enum(["solid", "dashed", "dotted"]).optional(),
+      .optional()
+      .nullable(),
+    currentItemStrokeWidth: z
+      .number()
+      .finite()
+      .min(0)
+      .max(50)
+      .optional()
+      .nullable(),
+    currentItemStrokeStyle: z
+      .enum(["solid", "dashed", "dotted"])
+      .optional()
+      .nullable(),
     currentItemRoundness: z
       .object({
         type: z.enum(["round", "sharp"]),
         value: z.number().finite().min(0).max(1),
       })
-      .optional(),
-    currentItemFontSize: z.number().finite().min(1).max(200).optional(),
-    currentItemFontFamily: z.number().finite().min(1).max(5).optional(),
-    currentItemTextAlign: z.enum(["left", "center", "right"]).optional(),
-    currentItemVerticalAlign: z.enum(["top", "middle", "bottom"]).optional(),
-    scrollX: z.number().finite().min(-1000000).max(1000000).optional(),
-    scrollY: z.number().finite().min(-1000000).max(1000000).optional(),
+      .optional()
+      .nullable(),
+    currentItemFontSize: z
+      .number()
+      .finite()
+      .min(1)
+      .max(500)
+      .optional()
+      .nullable(),
+    currentItemFontFamily: z
+      .number()
+      .finite()
+      .min(1)
+      .max(10)
+      .optional()
+      .nullable(),
+    currentItemTextAlign: z
+      .enum(["left", "center", "right"])
+      .optional()
+      .nullable(),
+    currentItemVerticalAlign: z
+      .enum(["top", "middle", "bottom"])
+      .optional()
+      .nullable(),
+    scrollX: z
+      .number()
+      .finite()
+      .min(-10000000)
+      .max(10000000)
+      .optional()
+      .nullable(),
+    scrollY: z
+      .number()
+      .finite()
+      .min(-10000000)
+      .max(10000000)
+      .optional()
+      .nullable(),
     zoom: z
       .object({
-        value: z.number().finite().min(0.1).max(10),
+        value: z.number().finite().min(0.01).max(100),
       })
-      .optional(),
-    selection: z.array(z.string()).optional(),
-    selectedElementIds: z.record(z.string(), z.boolean()).optional(),
-    selectedGroupIds: z.record(z.string(), z.boolean()).optional(),
+      .optional()
+      .nullable(),
+    selection: z.array(z.string()).optional().nullable(),
+    selectedElementIds: z.record(z.string(), z.boolean()).optional().nullable(),
+    selectedGroupIds: z.record(z.string(), z.boolean()).optional().nullable(),
     activeEmbeddable: z
       .object({
         elementId: z.string(),
         state: z.string(),
       })
-      .optional(),
+      .optional()
+      .nullable(),
     activeTool: z
       .object({
         type: z.string(),
-        customType: z.string().optional(),
+        customType: z.string().optional().nullable(),
       })
-      .optional(),
-    cursorX: z.number().finite().optional(),
-    cursorY: z.number().finite().optional(),
-    // Sanitize any string values in appState
+      .optional()
+      .nullable(),
+    cursorX: z.number().finite().optional().nullable(),
+    cursorY: z.number().finite().optional().nullable(),
+    // Add common Excalidraw app state properties
+    collaborators: z.record(z.string(), z.any()).optional().nullable(),
   })
-  .strict()
+  // Allow any additional properties
   .catchall(
     z.any().refine((val) => {
-      // Recursively sanitize any string values found in the object
+      // Sanitize string values, but be more permissive for other types
       if (typeof val === "string") {
         return sanitizeText(val, 1000);
       }
+      // Allow numbers, booleans, objects, arrays, null, undefined
       return true;
     })
   );