socks inbound is a socks4, socks4a, socks5 server.
{
  "type": "socks",
  "tag": "socks-in",
  ... // Listen Fields
  "users": [
    {
      "username": "admin",
      "password": "admin"
    }
  ]
}
See Listen Fields for details.
SOCKS users.
No authentication required if empty.