code: nextjs,frontends,security (3 files)

dbal/cpp/src/daemon/http/security_limits.hpp

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+/**
+ * @file security_limits.hpp
+ * @brief Security constants and limits for HTTP server
+ * 
+ * Defines limits to prevent CVE-style attacks.
+ */
+#ifndef DBAL_SECURITY_LIMITS_HPP
+#define DBAL_SECURITY_LIMITS_HPP
+
+#include <cstddef>
+
+namespace dbal {
+namespace daemon {
+namespace http {
+
+// Security limits to prevent CVE-style attacks
+constexpr size_t MAX_REQUEST_SIZE = 65536;          // 64KB max request (prevent buffer overflow)
+constexpr size_t MAX_HEADERS = 100;                  // Max 100 headers (prevent header bomb)
+constexpr size_t MAX_HEADER_SIZE = 8192;             // 8KB max per header
+constexpr size_t MAX_PATH_LENGTH = 2048;             // Max URL path length
+constexpr size_t MAX_BODY_SIZE = 10485760;           // 10MB max body size
+constexpr size_t MAX_CONCURRENT_CONNECTIONS = 1000;  // Prevent thread exhaustion
+
+} // namespace http
+} // namespace daemon
+} // namespace dbal
+
+#endif

frontends/nextjs/src/app/packages/[...path]/route.ts

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+import { NextResponse } from 'next/server'
+import { readFile, stat } from 'fs/promises'
+import { getPackageContentType } from '@/lib/packages/server/get-package-content-type'
+import { resolvePackageFilePath } from '@/lib/packages/server/resolve-package-file-path'
+
+interface PackageParams {
+  path?: string[]
+}
+
+export async function GET(request: Request, { params }: { params: PackageParams }) {
+  const segments = params.path ?? []
+  const filePath = resolvePackageFilePath(segments)
+
+  if (!filePath) {
+    return NextResponse.json({ error: 'Not found' }, { status: 404 })
+  }
+
+  try {
+    const fileStat = await stat(filePath)
+    if (!fileStat.isFile()) {
+      return NextResponse.json({ error: 'Not found' }, { status: 404 })
+    }
+
+    const fileBuffer = await readFile(filePath)
+    const contentType = getPackageContentType(filePath)
+
+    return new NextResponse(fileBuffer, {
+      headers: {
+        'Content-Type': contentType,
+      },
+    })
+  } catch (error) {
+    return NextResponse.json({ error: 'Not found' }, { status: 404 })
+  }
+}

frontends/nextjs/src/lib/packages/server/resolve-package-file-path.test.ts

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+import { describe, expect, it } from 'vitest'
+import { resolvePackageFilePath } from './resolve-package-file-path'
+
+const root = '/repo/packages'
+
+describe('resolvePackageFilePath', () => {
+  it('returns null for empty path', () => {
+    expect(resolvePackageFilePath([], root)).toBeNull()
+  })
+
+  it('returns resolved path for valid segments', () => {
+    expect(resolvePackageFilePath(['social_hub', 'seed', 'metadata.json'], root)).toBe(
+      '/repo/packages/social_hub/seed/metadata.json'
+    )
+  })
+
+  it('blocks path traversal', () => {
+    expect(resolvePackageFilePath(['..', 'secrets.txt'], root)).toBeNull()
+  })
+})