rspec/rules/S2653/java/rule.adoc

== Why is this an issue?

There is no reason to have a ``++main++`` method in a web application. It may have been useful for debugging during application development, but such a method should never make it into production. Having a ``++main++`` method in a web application opens a door to the application logic that an attacker may never be able to reach (but watch out if one does!), but it is a sloppy practice and indicates that other problems may be present.


This rule raises an issue when a ``++main++`` method is found in a servlet or an EJB.


=== Noncompliant code example

[source,java]
----
public class MyServlet extends HttpServlet {
  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
    if (userIsAuthorized(req)) {
      updatePrices(req);
    }
  }

  public static void main(String[] args) { // Noncompliant
    updatePrices(req);
  }
}
----


== Resources

* https://www.owasp.org/www-project-top-ten/2017/A3_2017-Sensitive_Data_Exposure[OWASP Top 10 2017 Category A3] - Sensitive Data Exposure
* https://cwe.mitre.org/data/definitions/489[MITRE, CWE-489] - Active Debug Code
* https://wiki.sei.cmu.edu/confluence/x/qzVGBQ[CERT, ENV06-J.] - Production code must not contain debugging entry points


ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Remove this unwanted "main" method.


'''
== Comments And Links
(visible only on this page)

=== on 8 Apr 2015, 15:03:33 Nicolas Peru wrote:
\[~ann.campbell.2]From example, I have no idea why this could be a security threat. And I am not sure which main methods we are supposed to detect ? the ones defined in Servlet classes ? if yes, this should be specified.

=== on 8 Apr 2015, 18:58:52 Ann Campbell wrote:
How's it look now, [~nicolas.peru]?

=== on 9 Apr 2015, 07:37:22 Nicolas Peru wrote:
\[~ann.campbell.2] looks ok !

=== on 12 Jun 2015, 13:09:22 Ann Campbell wrote:
CodePro: Illegal Main Method

endif::env-github,rspecator-view[]