Java Web desde cero en Netbeans ☁️[25.- Consultas preparadas para evitar inyección sql?]
En este tutorial vamos a evitar la inyección de SQL con consultas preparadas que nos ofrece java.
? 05.-Firewall y Access en CloudFlare☁️. Tutorial en español (2019): https://www.youtube.com/watch?v=eOe589EUJhQ
?Tutorial de cloudflare: https://www.youtube.com/playlist?list=PLCTD_CpMeEKTipTlrB5em9K9wwtUdLmO6
? Rate Limiting to protect: https://support.cloudflare.com/hc/en-us/articles/115001993248-How-do-I-use-Rate-Limiting-to-protect-against-brute-force-attacks-
Codigo: https://github.com/programadornovato/javaWeb/commit/4b7c7e06babf35c956bbc9b7f040c69f8f16b6dc
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;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @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){
//nombre=nombre.replaceAll("'", "\\\\'");
nombre=this.mysql_real_scape_string(nombre);
where=where+" and nombre=? ";
}
query=query+where;
//out.println(query);
PreparedStatement preparar=con.prepareStatement(query);
if(nombre!=null){
preparar.setString(1, nombre);
}
rs=preparar.executeQuery();
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);
}finally{
try {
con.close();
} catch (SQLException ex) {
Logger.getLogger(Empleados.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
public String mysql_real_scape_string(String texto){
texto=texto.replaceAll("\\\\", "\\\\\\\\'");
texto=texto.replaceAll("\\n", "\\\\n'");
texto=texto.replaceAll("\\r", "\\\\r'");
texto=texto.replaceAll("\\t", "\\\\t'");
texto=texto.replaceAll("\\n", "\\\\n'");
texto=texto.replaceAll("'", "\\\\'");
return texto;
}
// <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>
}
? Pagina de sqlmap: http://sqlmap.org/
Descubrir la BD
sqlmap -u http://192.168.8.103/cat.php?id=2 –dbs
Aumentar el nivel y riesgo
sqlmap -u http://192.168.8.103/cat.php?id=2 –dbs –level=5 –risk=3
?Sqlmap en Kali Linux: https://www.youtube.com/watch?v=TRR5TWr-HFI
?Instalar kali linux en una usb desde windows 10: https://youtu.be/6POGcKizDts
?Blog con vulnerabilidades para hacer pentatesting con kali linux ?:https://www.youtube.com/watch?v=EuYJSXqngTY
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
Gracias por apoyar este canal: https://www.patreon.com/programadornovato?fan_landing=true
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