CWE-577: EJB Bad Practices: Use of Sockets
Description
The product violates the Enterprise JavaBeans (EJB) specification by using sockets.
Submission Date :
Dec. 15, 2006, midnight
Modification Date :
2023-06-29 00:00:00+00:00
Organization :
MITRE
Extended Description
The Enterprise JavaBeans specification requires that every bean provider follow a set of programming guidelines designed to ensure that the bean will be portable and behave consistently in any EJB container. In this case, the product violates the following EJB guideline: "An enterprise bean must not attempt to listen on a socket, accept connections on a socket, or use a socket for multicast." The specification justifies this requirement in the following way: "The EJB architecture allows an enterprise bean instance to be a network socket client, but it does not allow it to be a network server. Allowing the instance to become a network server would conflict with the basic function of the enterprise bean-- to serve the EJB clients."
Example - 1
The following Java example is a simple stateless Enterprise JavaBean that retrieves stock symbols and stock values. The Enterprise JavaBean creates a socket and listens for and accepts connections from clients on the socket.
serverSocket = new ServerSocket(Constants.SOCKET_PORT);
clientSocket = serverSocket.accept();try {} catch (IOException ex) {...}try {} catch (IOException e) {...}
ServerSocket serverSocket = null;Socket clientSocket = null;public StockSymbolBean() {}public String getStockSymbol(String name) {...}public BigDecimal getStockValue(String symbol) {...}private void processClientInputFromSocket() {...}@Statelesspublic class StockSymbolBean implements StockSymbolRemote {}And the following Java example is similar to the previous example but demonstrates the use of multicast socket connections within an Enterprise JavaBean.
serverSocket = new ServerSocket(Constants.SOCKET_PORT);
start();try {} catch (IOException ex) {...}listening = true;while(listening) {}
clientSocket = serverSocket.accept();
try {} catch (IOException e) {...}...
ServerSocket serverSocket = null;Socket clientSocket = null;boolean listening = false;public StockSymbolBean() {}public String getStockSymbol(String name) {...}public BigDecimal getStockValue(String symbol) {...}public void run() {}@Statelesspublic class StockSymbolBean extends Thread implements StockSymbolRemote {}The previous two examples within any type of Enterprise JavaBean violate the EJB specification by attempting to listen on a socket, accepting connections on a socket, or using a socket for multicast.
Related Weaknesses
This table shows the weaknesses and high level categories that are related to this weakness. These relationships are defined to give an overview of the different insight to similar items that may exist at higher and lower levels of abstraction.
Visit http://cwe.mitre.org/ for more details.