validate SQlite magic header

fix bind mount prisma, auto hydrate empty folder

backend/Dockerfile

@@ -36,8 +36,9 @@ COPY package*.json ./
 # Install production dependencies only
 RUN npm ci --only=production
 
-# Copy prisma schema and migrations
+# Copy prisma schema and migrations for runtime and hydration template
 COPY prisma ./prisma/
+COPY prisma ./prisma_template/
 
 # Copy built application from builder
 COPY --from=builder /app/dist ./dist

backend/docker-entrypoint.sh

@@ -1,6 +1,12 @@
 #!/bin/sh
 set -e
 
+# Auto-hydrate prisma directory when bind-mounted volume is empty
+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/
+fi
+
 # Run migrations
 npx prisma migrate deploy
 

backend/prisma/schema.prisma

@@ -4,7 +4,7 @@
 generator client {
   provider      = "prisma-client-js"
   output        = "../src/generated/client"
-  binaryTargets = ["native", "linux-musl-arm64-openssl-3.0.x"]
+  binaryTargets = ["native", "linux-musl-arm64-openssl-3.0.x", "linux-musl-openssl-3.0.x"]
 }
 
 datasource db {

backend/src/generated/client/edge.js

@@ -148,6 +148,10 @@ const config = {
       {
         "fromEnvVar": null,
         "value": "linux-musl-arm64-openssl-3.0.x"
+      },
+      {
+        "fromEnvVar": null,
+        "value": "linux-musl-openssl-3.0.x"
       }
     ],
     "previewFeatures": [],
@@ -165,6 +169,7 @@ const config = {
     "db"
   ],
   "activeProvider": "sqlite",
+  "postinstall": false,
   "inlineDatasources": {
     "db": {
       "url": {
@@ -173,8 +178,8 @@ const config = {
       }
     }
   },
-  "inlineSchema": "// This is your Prisma schema file,\n// learn more about it in the docs: https://pris.ly/d/prisma-schema\n\ngenerator client {\n  provider      = \"prisma-client-js\"\n  output        = \"../src/generated/client\"\n  binaryTargets = [\"native\", \"linux-musl-arm64-openssl-3.0.x\"]\n}\n\ndatasource db {\n  provider = \"sqlite\"\n  url      = env(\"DATABASE_URL\")\n}\n\nmodel Collection {\n  id        String    @id @default(uuid())\n  name      String\n  drawings  Drawing[]\n  createdAt DateTime  @default(now())\n  updatedAt DateTime  @updatedAt\n}\n\nmodel Drawing {\n  id           String      @id @default(uuid())\n  name         String\n  elements     String // Stored as JSON string\n  appState     String // Stored as JSON string\n  files        String      @default(\"{}\") // Stored as JSON string\n  preview      String? // SVG string for thumbnail\n  version      Int         @default(1)\n  collectionId String?\n  collection   Collection? @relation(fields: [collectionId], references: [id])\n  createdAt    DateTime    @default(now())\n  updatedAt    DateTime    @updatedAt\n}\n",
-  "inlineSchemaHash": "9864a039193c73ddda01fd51751788fa5729bb0a603a9379a3fa314a4aced64f",
+  "inlineSchema": "// This is your Prisma schema file,\n// learn more about it in the docs: https://pris.ly/d/prisma-schema\n\ngenerator client {\n  provider      = \"prisma-client-js\"\n  output        = \"../src/generated/client\"\n  binaryTargets = [\"native\", \"linux-musl-arm64-openssl-3.0.x\", \"linux-musl-openssl-3.0.x\"]\n}\n\ndatasource db {\n  provider = \"sqlite\"\n  url      = env(\"DATABASE_URL\")\n}\n\nmodel Collection {\n  id        String    @id @default(uuid())\n  name      String\n  drawings  Drawing[]\n  createdAt DateTime  @default(now())\n  updatedAt DateTime  @updatedAt\n}\n\nmodel Drawing {\n  id           String      @id @default(uuid())\n  name         String\n  elements     String // Stored as JSON string\n  appState     String // Stored as JSON string\n  files        String      @default(\"{}\") // Stored as JSON string\n  preview      String? // SVG string for thumbnail\n  version      Int         @default(1)\n  collectionId String?\n  collection   Collection? @relation(fields: [collectionId], references: [id])\n  createdAt    DateTime    @default(now())\n  updatedAt    DateTime    @updatedAt\n}\n",
+  "inlineSchemaHash": "30da526c2a5efdf3e5097c3736a52d47246ca4da8e5bd0401a3f28dd46ab5c3e",
   "copyEngine": true
 }
 config.dirname = '/'

backend/src/generated/client/index.js

@@ -149,6 +149,10 @@ const config = {
       {
         "fromEnvVar": null,
         "value": "linux-musl-arm64-openssl-3.0.x"
+      },
+      {
+        "fromEnvVar": null,
+        "value": "linux-musl-openssl-3.0.x"
       }
     ],
     "previewFeatures": [],
@@ -166,6 +170,7 @@ const config = {
     "db"
   ],
   "activeProvider": "sqlite",
+  "postinstall": false,
   "inlineDatasources": {
     "db": {
       "url": {
@@ -174,8 +179,8 @@ const config = {
       }
     }
   },
-  "inlineSchema": "// This is your Prisma schema file,\n// learn more about it in the docs: https://pris.ly/d/prisma-schema\n\ngenerator client {\n  provider      = \"prisma-client-js\"\n  output        = \"../src/generated/client\"\n  binaryTargets = [\"native\", \"linux-musl-arm64-openssl-3.0.x\"]\n}\n\ndatasource db {\n  provider = \"sqlite\"\n  url      = env(\"DATABASE_URL\")\n}\n\nmodel Collection {\n  id        String    @id @default(uuid())\n  name      String\n  drawings  Drawing[]\n  createdAt DateTime  @default(now())\n  updatedAt DateTime  @updatedAt\n}\n\nmodel Drawing {\n  id           String      @id @default(uuid())\n  name         String\n  elements     String // Stored as JSON string\n  appState     String // Stored as JSON string\n  files        String      @default(\"{}\") // Stored as JSON string\n  preview      String? // SVG string for thumbnail\n  version      Int         @default(1)\n  collectionId String?\n  collection   Collection? @relation(fields: [collectionId], references: [id])\n  createdAt    DateTime    @default(now())\n  updatedAt    DateTime    @updatedAt\n}\n",
-  "inlineSchemaHash": "9864a039193c73ddda01fd51751788fa5729bb0a603a9379a3fa314a4aced64f",
+  "inlineSchema": "// This is your Prisma schema file,\n// learn more about it in the docs: https://pris.ly/d/prisma-schema\n\ngenerator client {\n  provider      = \"prisma-client-js\"\n  output        = \"../src/generated/client\"\n  binaryTargets = [\"native\", \"linux-musl-arm64-openssl-3.0.x\", \"linux-musl-openssl-3.0.x\"]\n}\n\ndatasource db {\n  provider = \"sqlite\"\n  url      = env(\"DATABASE_URL\")\n}\n\nmodel Collection {\n  id        String    @id @default(uuid())\n  name      String\n  drawings  Drawing[]\n  createdAt DateTime  @default(now())\n  updatedAt DateTime  @updatedAt\n}\n\nmodel Drawing {\n  id           String      @id @default(uuid())\n  name         String\n  elements     String // Stored as JSON string\n  appState     String // Stored as JSON string\n  files        String      @default(\"{}\") // Stored as JSON string\n  preview      String? // SVG string for thumbnail\n  version      Int         @default(1)\n  collectionId String?\n  collection   Collection? @relation(fields: [collectionId], references: [id])\n  createdAt    DateTime    @default(now())\n  updatedAt    DateTime    @updatedAt\n}\n",
+  "inlineSchemaHash": "30da526c2a5efdf3e5097c3736a52d47246ca4da8e5bd0401a3f28dd46ab5c3e",
   "copyEngine": true
 }
 
@@ -219,6 +224,10 @@ path.join(process.cwd(), "src/generated/client/libquery_engine-darwin-arm64.dyli
 // file annotations for bundling tools to include these files
 path.join(__dirname, "libquery_engine-linux-musl-arm64-openssl-3.0.x.so.node");
 path.join(process.cwd(), "src/generated/client/libquery_engine-linux-musl-arm64-openssl-3.0.x.so.node")
+
+// file annotations for bundling tools to include these files
+path.join(__dirname, "libquery_engine-linux-musl-openssl-3.0.x.so.node");
+path.join(process.cwd(), "src/generated/client/libquery_engine-linux-musl-openssl-3.0.x.so.node")
 // file annotations for bundling tools to include these files
 path.join(__dirname, "schema.prisma");
 path.join(process.cwd(), "src/generated/client/schema.prisma")

backend/src/generated/client/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-04007c5051869a2f5298bd562ab2fb60a423747e0d5699dd1a73a4757b2657b6",
+  "name": "prisma-client-6afe3d9baa793154c8d01c79f8418d91423e5ccaec794547bf848a451459cf53",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "index-browser.js",

backend/src/generated/client/schema.prisma

@@ -4,7 +4,7 @@
 generator client {
   provider      = "prisma-client-js"
   output        = "../src/generated/client"
-  binaryTargets = ["native", "linux-musl-arm64-openssl-3.0.x"]
+  binaryTargets = ["native", "linux-musl-arm64-openssl-3.0.x", "linux-musl-openssl-3.0.x"]
 }
 
 datasource db {

backend/src/index.ts

@@ -38,7 +38,26 @@ const resolveDatabaseUrl = (rawUrl?: string) => {
 process.env.DATABASE_URL = resolveDatabaseUrl(process.env.DATABASE_URL);
 console.log("Resolved DATABASE_URL:", process.env.DATABASE_URL);
 
-const allowedOrigin = process.env.FRONTEND_URL || "http://localhost:6767";
+const normalizeOrigins = (rawOrigins?: string | null): string[] => {
+  const fallback = "http://localhost:6767";
+  if (!rawOrigins || rawOrigins.trim().length === 0) {
+    return [fallback];
+  }
+
+  const ensureProtocol = (origin: string) =>
+    /^https?:\/\//i.test(origin) ? origin : `http://${origin}`;
+
+  const parsed = rawOrigins
+    .split(",")
+    .map((origin) => origin.trim())
+    .filter((origin) => origin.length > 0)
+    .map(ensureProtocol);
+
+  return parsed.length > 0 ? parsed : [fallback];
+};
+
+const allowedOrigins = normalizeOrigins(process.env.FRONTEND_URL);
+console.log("Allowed origins:", allowedOrigins);
 
 const uploadDir = path.resolve(__dirname, "../uploads");
 if (!fs.existsSync(uploadDir)) {
@@ -49,7 +68,7 @@ const app = express();
 const httpServer = createServer(app);
 const io = new Server(httpServer, {
   cors: {
-    origin: allowedOrigin,
+    origin: allowedOrigins,
     credentials: true,
   },
   maxHttpBufferSize: 1e8, // 100 MB
@@ -62,7 +81,7 @@ const upload = multer({ dest: uploadDir });
 
 app.use(
   cors({
-    origin: allowedOrigin,
+    origin: allowedOrigins,
     credentials: true,
   })
 );
@@ -106,7 +125,47 @@ const respondWithValidationErrors = (
   });
 };
 
+const validateSqliteHeader = (filePath: string): boolean => {
+  try {
+    const buffer = Buffer.alloc(16);
+    const fd = fs.openSync(filePath, "r");
+    const bytesRead = fs.readSync(fd, buffer, 0, 16, 0);
+    fs.closeSync(fd);
+
+    if (bytesRead < 16) {
+      console.warn("File too small to be a valid SQLite database");
+      return false;
+    }
+
+    // SQLite format 3 header: "SQLite format 3\0" (16 bytes)
+    // Hex: 53 51 4c 69 74 65 20 66 6f 72 6d 61 74 20 33 00
+    const expectedHeader = Buffer.from([
+      0x53, 0x51, 0x4c, 0x69, 0x74, 0x65, 0x20, 0x66, 0x6f, 0x72, 0x6d, 0x61,
+      0x74, 0x20, 0x33, 0x00,
+    ]);
+
+    const isValid = buffer.equals(expectedHeader);
+    if (!isValid) {
+      console.warn("Invalid SQLite file header detected", {
+        filePath,
+        header: buffer.toString("hex"),
+        expected: expectedHeader.toString("hex"),
+      });
+    }
+
+    return isValid;
+  } catch (error) {
+    console.error("Failed to validate SQLite header:", error);
+    return false;
+  }
+};
+
 const runIntegrityCheck = (filePath: string): boolean => {
+  // First validate the file header to prevent RCE attacks
+  if (!validateSqliteHeader(filePath)) {
+    return false;
+  }
+
   let dbInstance: Database.Database | undefined;
   try {
     dbInstance = new Database(filePath, {

frontend/src/utils/identity.ts

@@ -80,6 +80,31 @@ const COLORS = [
   "#f43f5e", // rose-500
 ];
 
+const generateClientId = (): string => {
+  const cryptoObj: Crypto | undefined =
+    typeof globalThis !== "undefined"
+      ? globalThis.crypto || (globalThis as any).msCrypto
+      : undefined;
+
+  if (cryptoObj?.randomUUID) {
+    return cryptoObj.randomUUID();
+  }
+
+  if (cryptoObj?.getRandomValues) {
+    const bytes = new Uint8Array(16);
+    cryptoObj.getRandomValues(bytes);
+    bytes[6] = (bytes[6] & 0x0f) | 0x40; // RFC 4122 variant
+    bytes[8] = (bytes[8] & 0x3f) | 0x80;
+    const hex = Array.from(bytes, (b) => b.toString(16).padStart(2, "0"));
+    return `${hex.slice(0, 4).join("")}-${hex.slice(4, 6).join("")}-${hex
+      .slice(6, 8)
+      .join("")}-${hex.slice(8, 10).join("")}-${hex.slice(10).join("")}`;
+  }
+
+  // Final fallback for very old browsers; uniqueness window-scoped only.
+  return `id-${Date.now().toString(16)}-${Math.random().toString(16).slice(2)}`;
+};
+
 export const getUserIdentity = (): UserIdentity => {
   const stored = localStorage.getItem("excalidash-user-id");
   if (stored) {
@@ -91,7 +116,7 @@ export const getUserIdentity = (): UserIdentity => {
   const randomColor = COLORS[Math.floor(Math.random() * COLORS.length)];
 
   const identity: UserIdentity = {
-    id: crypto.randomUUID(),
+    id: generateClientId(),
     name: randomTransformer.name,
     initials: randomTransformer.initials,
     color: randomColor,