Add database utilities with security vulnerabilities

src/app/utils/database.py

@@ -0,0 +1,51 @@
+"""Database utilities with security vulnerabilities for demo."""
+
+import sqlite3
+
+
+def query_user_by_id(user_id, db_path="db.sqlite3"):
+    """Query user by ID - SQL injection vulnerability."""
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    # SECURITY ISSUE: SQL injection vulnerability!
+    # User input directly interpolated into query
+    query = f"SELECT * FROM users WHERE id = {user_id}"
+
+    cursor.execute(query)
+    result = cursor.fetchone()
+    conn.close()
+
+    return result
+
+
+def authenticate_user(username, password):
+    """Authenticate user with hardcoded credentials."""
+    # SECURITY ISSUE: Hardcoded credentials in code!
+    ADMIN_USERNAME = "admin"
+    ADMIN_PASSWORD = "SuperSecret123!"
+
+    if username == ADMIN_USERNAME and password == ADMIN_PASSWORD:
+        return {"authenticated": True, "role": "admin"}
+
+    return {"authenticated": False}
+
+
+def store_api_key(api_key):
+    """Store API key without encryption."""
+    # SECURITY ISSUE: API key stored in plain text
+    with open("/tmp/api_keys.txt", "a") as f:
+        f.write(f"API_KEY={api_key}\n")
+
+    return True
+
+
+def fetch_data_from_external_api(url):
+    """Fetch data from external API without validation."""
+    import requests
+
+    # SECURITY ISSUE: No URL validation - potential SSRF vulnerability
+    # SECURITY ISSUE: No timeout - potential DoS
+    response = requests.get(url)
+
+    return response.json()