From 4b44996aacbedc092f45415e103b0f07b42114e1 Mon Sep 17 00:00:00 2001
From: Jannis Braun <151788261+TheZwiss@users.noreply.github.com>
Date: Sat, 20 Jun 2026 02:15:39 +0200
Subject: [PATCH] feat(security): idempotent remediation script to rotate
 seeded admin123 on existing instances

---
 .../src/scripts/remediate-seed-admin.test.ts  | 42 ++++++++++++++
 .../src/scripts/remediate-seed-admin.ts       | 58 +++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 packages/server/src/scripts/remediate-seed-admin.test.ts
 create mode 100644 packages/server/src/scripts/remediate-seed-admin.ts

diff --git a/packages/server/src/scripts/remediate-seed-admin.test.ts b/packages/server/src/scripts/remediate-seed-admin.test.ts
new file mode 100644
index 00000000..d2c24cbb
--- /dev/null
+++ b/packages/server/src/scripts/remediate-seed-admin.test.ts
@@ -0,0 +1,42 @@
+import { describe, it, expect } from 'vitest';
+import Database from 'better-sqlite3';
+import { hashPassword, verifyPassword } from '../utils/auth.js';
+import { remediateSeedAdmin } from './remediate-seed-admin.js';
+
+async function freshDbWithUser(opts: {
+  username: string; password: string; isAdmin: number; homeInstance: string | null;
+}): Promise<Database.Database> {
+  const db = new Database(':memory:');
+  db.exec(`CREATE TABLE users (
+    id TEXT PRIMARY KEY, username TEXT, display_name TEXT, password_hash TEXT,
+    is_admin INTEGER DEFAULT 0, home_instance TEXT, created_at INTEGER
+  )`);
+  db.prepare(
+    'INSERT INTO users (id, username, password_hash, is_admin, home_instance, created_at) VALUES (?,?,?,?,?,?)'
+  ).run('1', opts.username, await hashPassword(opts.password), opts.isAdmin, opts.homeInstance, 1);
+  return db;
+}
+
+describe('remediateSeedAdmin', () => {
+  it('rotates the password when admin still uses admin123', async () => {
+    const db = await freshDbWithUser({ username: 'admin', password: 'admin123', isAdmin: 1, homeInstance: null });
+    const result = await remediateSeedAdmin(db);
+    expect(result.action).toBe('rotated');
+    expect(result.newPassword).toBeTruthy();
+    const row = db.prepare("SELECT password_hash FROM users WHERE username = 'admin'").get() as { password_hash: string };
+    expect(await verifyPassword('admin123', row.password_hash)).toBe(false);
+    expect(await verifyPassword(result.newPassword!, row.password_hash)).toBe(true);
+  });
+
+  it('is a no-op when the password is already changed', async () => {
+    const db = await freshDbWithUser({ username: 'admin', password: 'a-real-strong-pw', isAdmin: 1, homeInstance: null });
+    const result = await remediateSeedAdmin(db);
+    expect(result.action).toBe('noop');
+  });
+
+  it('ignores a federated user named admin', async () => {
+    const db = await freshDbWithUser({ username: 'admin', password: 'admin123', isAdmin: 0, homeInstance: 'other.example' });
+    const result = await remediateSeedAdmin(db);
+    expect(result.action).toBe('skipped-no-admin');
+  });
+});
diff --git a/packages/server/src/scripts/remediate-seed-admin.ts b/packages/server/src/scripts/remediate-seed-admin.ts
new file mode 100644
index 00000000..50f119cd
--- /dev/null
+++ b/packages/server/src/scripts/remediate-seed-admin.ts
@@ -0,0 +1,58 @@
+import Database from 'better-sqlite3';
+import crypto from 'node:crypto';
+import fs from 'node:fs';
+import path from 'node:path';
+import { verifyPassword, hashPassword } from '../utils/auth.js';
+
+type AdminRow = { id: string; password_hash: string };
+
+export async function remediateSeedAdmin(
+  db: Database.Database
+): Promise<{ action: 'rotated' | 'noop' | 'skipped-no-admin'; newPassword?: string }> {
+  // Local admin named 'admin' only — replicated users (home_instance set) are never seed admins.
+  const admin = db
+    .prepare("SELECT id, password_hash FROM users WHERE username = 'admin' AND home_instance IS NULL AND is_admin = 1")
+    .get() as AdminRow | undefined;
+
+  if (!admin) return { action: 'skipped-no-admin' };
+
+  const stillDefault = await verifyPassword('admin123', admin.password_hash);
+  if (!stillDefault) return { action: 'noop' };
+
+  const newPassword = crypto.randomBytes(18).toString('base64url'); // 24-char strong password
+  const newHash = await hashPassword(newPassword);
+  db.prepare('UPDATE users SET password_hash = ? WHERE id = ?').run(newHash, admin.id);
+
+  return { action: 'rotated', newPassword };
+}
+
+// CLI entrypoint: run inside the container via
+//   docker exec -w /app/packages/server backspace node --import tsx/esm src/scripts/remediate-seed-admin.ts
+const isMain = process.argv[1] && process.argv[1].endsWith('remediate-seed-admin.ts');
+if (isMain) {
+  const dbPath = process.env.DB_PATH || '/app/data/backspace.db';
+  const db = new Database(dbPath);
+  db.pragma('journal_mode = WAL');
+  remediateSeedAdmin(db)
+    .then((r) => {
+      if (r.action === 'rotated') {
+        // No print-once lockout: also persist to a root-owned file next to the DB
+        // (on the bind-mount → visible on the host as data/seed-admin-rotated.txt).
+        const outFile = path.join(path.dirname(dbPath), 'seed-admin-rotated.txt');
+        fs.writeFileSync(outFile, `${r.newPassword}\n`, { mode: 0o600 });
+        console.log('Seed admin password ROTATED.');
+        console.log(`  New password: ${r.newPassword}`);
+        console.log(`  Also written to: ${outFile} (delete after you have stored it)`);
+      } else if (r.action === 'noop') {
+        console.log('Seed admin password already changed — nothing to do.');
+      } else {
+        console.log('No local seed admin found — nothing to do.');
+      }
+      db.close();
+    })
+    .catch((err) => {
+      console.error('Remediation failed:', err);
+      db.close();
+      process.exit(1);
+    });
+}