{"id":28815,"date":"2024-04-18T05:12:48","date_gmt":"2024-04-18T04:12:48","guid":{"rendered":"https:\/\/nelkodev.com\/blog\/guia-completa-para-crear-un-sistema-de-autenticacion-seguro-en-php\/"},"modified":"2024-06-03T18:39:17","modified_gmt":"2024-06-03T17:39:17","slug":"guia-completa-para-crear-un-sistema-de-autenticacion-seguro-en-php","status":"publish","type":"post","link":"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/","title":{"rendered":"Complete Guide to Creating a Secure Authentication System in PHP"},"content":{"rendered":"<p>Creating a secure authentication system is crucial to protecting user information and data. In PHP, one of the most used programming languages for web development, implementing a robust and secure authentication system can be a challenging but essential task. This tutorial will guide you step by step to build an authentication system in PHP from scratch, covering essential security practices to protect user credentials and information.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ffffff;color:#ffffff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ffffff;color:#ffffff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Comprendiendo_la_Importancia_de_la_Seguridad_en_la_Autenticacion\" >Understanding the Importance of Security in Authentication<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Configurando_el_Entorno_de_Desarrollo\" >Setting up the Development Environment<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Instalacion_de_Dependencias\" >Installation of Dependencies<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Creando_la_Base_de_Datos\" >Creating the Database<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Registrando_Usuarios\" >Registering Users<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#El_Formulario_de_Registro\" >The Registration Form<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Procesando_el_Registro_en_PHP\" >Processing the Registry in PHP<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Implementando_el_Inicio_de_Sesion\" >Implementing Login<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#El_Formulario_de_Inicio_de_Sesion\" >The Login Form<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Procesando_el_Inicio_de_Sesion_en_PHP\" >Processing Login in PHP<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Mejorando_la_Seguridad\" >Improving Security<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Hashing_y_Salting_de_Contrasenas\" >Password Hashing and Salting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Prevencion_de_Inyecciones_SQL\" >SQL Injection Prevention<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Proteccion_contra_XSS\" >Protection against XSS<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/nelkodev.com\/en\/blog\/complete-guide-to-create-a-secure-authentication-system-in-php\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Comprendiendo_la_Importancia_de_la_Seguridad_en_la_Autenticacion\"><\/span>Understanding the Importance of Security in Authentication<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before we dive into the code, it is vital to understand why security in authentication systems is so important. Attacks such as SQL injection, Cross-Site Scripting (XSS), and others can compromise the security of your application, exposing users to identity theft, among other risks. Implementing an authentication system with appropriate security measures is key to mitigating these risks.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Configurando_el_Entorno_de_Desarrollo\"><\/span>Setting up the Development Environment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To get started, you&#039;ll need a local server (such as XAMPP or MAMP) that allows you to run PHP and a MySQL database. Make sure you have PHP 7 or higher installed, as newer versions offer better security features.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Instalacion_de_Dependencias\"><\/span>Installation of Dependencies<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Although PHP comes with many built-in functions, using libraries such as PHPMailer for email handling or libraries to better handle encryption can be useful. You can install these tools using Composer, PHP&#039;s dependency manager. Visit <a href=\"https:\/\/getcomposer.org\/\" rel=\"nofollow noopener\" target=\"_blank\">Composer&#039;s official website<\/a> for instructions on how to install it.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Creando_la_Base_de_Datos\"><\/span>Creating the Database<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The first step is to create a database that will store user information. Here is an example of how to do it in MySQL:<\/p>\n<pre><code class=\"&quot;language-sql&quot;\">CREATE DATABASE auth_system; USE auth_system; CREATE TABLE users ( id INT AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL, email VARCHAR(100) NOT NULL, password VARCHAR(255) NOT NULL, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP );<\/code><\/pre>\n<p>This basic database schema includes everything you need to get started: an ID for each user, a username, email, and password.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Registrando_Usuarios\"><\/span>Registering Users<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"El_Formulario_de_Registro\"><\/span>The Registration Form<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>First, create a simple HTML form for user registration.<\/p>\n<pre><code class=\"&quot;language-html&quot;\"><form method=\"POST\" action=\"register.php\"><label for=\"username\">Username:<\/label><input type=\"text\" id=\"username\" name=\"username\"> <label for=\"email\">E-mail:<\/label><input type=\"email\" id=\"email\" name=\"email\"> <label for=\"password\">Password:<\/label><input type=\"password\" id=\"password\" name=\"password\"> <button type=\"submit\">Register<\/button><\/form><\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Procesando_el_Registro_en_PHP\"><\/span>Processing the Registry in PHP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When the user submits the form, it is crucial to validate and sanitize the inputs to protect your application from attacks. This is where functions like <code>password_hash<\/code> come into play to secure passwords. See how you could handle the logging logic in <code>register.php<\/code>:<\/p>\n<pre><code class=\"&quot;language-php&quot;\">prepare($sql); $stmt-&gt;bind_param(&quot;sss&quot;, $username, $email, $password); $stmt-&gt;execute(); if ($stmt-&gt;affected_rows &gt; 0) { echo &quot;User registered successfully.&quot;; } else { echo &quot;Error registering user.&quot;; } } ?&gt;<\/code><\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Implementando_el_Inicio_de_Sesion\"><\/span>Implementing Login<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Similar to registration, you will need a login form and a PHP script to handle authentication. It is important to always use <code>password_verify<\/code> to check passwords.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"El_Formulario_de_Inicio_de_Sesion\"><\/span>The Login Form<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code class=\"&quot;language-html&quot;\"><form method=\"POST\" action=\"login.php\"><label for=\"email\">E-mail:<\/label><input type=\"email\" id=\"email\" name=\"email\"> <label for=\"password\">Password:<\/label><input type=\"password\" id=\"password\" name=\"password\"> <button type=\"submit\">Login<\/button><\/form><\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Procesando_el_Inicio_de_Sesion_en_PHP\"><\/span>Processing Login in PHP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code class=\"&quot;language-php&quot;\">prepare($sql); $stmt-&gt;bind_param(&quot;s&quot;, $email); $stmt-&gt;execute(); $result = $stmt-&gt;get_result(); $user = $result-&gt;fetch_assoc(); if ($user &amp;&amp; password_verify($password, $user[&#039;password&#039;])) { \/\/ Log in session_start(); $_SESSION[&#039;user_id&#039;] = $user[&#039;id&#039;]; $_SESSION[&#039;username&#039;] = $user[&#039;username&#039;]; echo &quot;Login successful!&quot;; } else { echo &quot;Credentials do not match.&quot;; } } ?&gt;<\/code><\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Mejorando_la_Seguridad\"><\/span>Improving Security<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Hashing_y_Salting_de_Contrasenas\"><\/span>Password Hashing and Salting<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You have already seen how <code>password_hash<\/code> y <code>password_verify<\/code> They can help you manage passwords securely. Always ensure that no sensitive data is saved in readable form in the database.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Prevencion_de_Inyecciones_SQL\"><\/span>SQL Injection Prevention<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Using prepared statements is an effective method to avoid SQL injections, as you have seen in the code examples. Never trust user-provided data.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Proteccion_contra_XSS\"><\/span>Protection against XSS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Be sure to escape and sanitize any data that will be displayed on your pages to prevent XSS attacks. Features like <code>htmlspecialchars<\/code> are essential in this regard.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Creating a secure authentication system in PHP requires meticulous attention to security details. By following the steps and practices described in this tutorial, you can implement a robust system that protects user information and strengthens the security of your web application. If you have questions or need more information, do not hesitate to contact me via <a href=\"https:\/\/nelkodev.com\/en\/contact\/\">my contact page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Creating a secure authentication system is crucial to protecting user information and data. In PHP, one of the most widely used programming languages for web development, implementing a robust and secure authentication system can be a challenging but essential task. This tutorial will guide you step by step to [\u2026]<\/p>","protected":false},"author":1,"featured_media":28816,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[420,2206,1907],"tags":[467,205,500,340,358,60,15,1008,18,1463,514],"class_list":["post-28815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-php","category-pruebas-de-seguridad","tag-autenticacion","tag-blog","tag-completa","tag-crear","tag-guia","tag-para","tag-php","tag-pruebas","tag-seguridad","tag-seguro","tag-sistema"],"_links":{"self":[{"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/posts\/28815","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/comments?post=28815"}],"version-history":[{"count":0,"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/posts\/28815\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/media\/28816"}],"wp:attachment":[{"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/media?parent=28815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/categories?post=28815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nelkodev.com\/en\/wp-json\/wp\/v2\/tags?post=28815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}