{"id":8999,"date":"2022-03-22T13:00:00","date_gmt":"2022-03-22T12:00:00","guid":{"rendered":"https:\/\/carontestudio.com\/blog\/?p=8999"},"modified":"2022-03-31T13:32:04","modified_gmt":"2022-03-31T11:32:04","slug":"como-evitar-inyeccion-de-sql-en-php","status":"publish","type":"post","link":"https:\/\/carontestudio.com\/blog\/como-evitar-inyeccion-de-sql-en-php\/","title":{"rendered":"C\u00f3mo evitar inyecci\u00f3n de SQL en PHP"},"content":{"rendered":"\n<p>En esta nueva entrada vamos a hablar sobre qu\u00e9 es SQL, <strong>qu\u00e9 es la inyecci\u00f3n de c\u00f3digo SQL<\/strong> y c\u00f3mo podemos evitarla en nuestro c\u00f3digo PHP.<\/p>\n\n\n\n<p>Las bases de datos se han convertido en algo esencial para organizar y distribuir la informaci\u00f3n de cualquier entorno inform\u00e1tico. SQL se ha convertido en la forma m\u00e1s com\u00fan de gestionar una base de datos, por ello es esencial saber <strong>qu\u00e9 es SQL<\/strong> y como emplearlo de forma segura.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfQu\u00e9 es SQL?<\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>SQL<\/strong> (Structured Query Language) es un <strong>lenguaje de programaci\u00f3n<\/strong> dise\u00f1ado para administrar sistemas de gesti\u00f3n de bases de datos. Mediante SQL es posible crear, consultar, editar y borrar informaci\u00f3n de una base de datos. Es el lenguaje de programaci\u00f3n m\u00e1s utilizado para gestionar bases de datos relacionales, es tan com\u00fan, que se ha convertido en un est\u00e1ndar.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"507\" height=\"337\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-sql.jpg\" alt=\"que es sql\" class=\"wp-image-9209\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-sql.jpg 507w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-sql-300x199.jpg 300w\" sizes=\"auto, (max-width: 507px) 100vw, 507px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Tipos de bases de datos SQL<\/h3>\n\n\n\n<p>Existen distintos tipos de bases de datos que emplean SQL, aunque en la mayor\u00eda de ellas algunas sentencias cambian, la l\u00f3gica a seguir es la misma y afortunadamente son todas muy similares. <\/p>\n\n\n\n<p>Estos son los tipos bases de datos SQL:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.oracle.com\/es\/index.html\" target=\"_blank\" rel=\"noreferrer noopener\">Oracle<\/a><\/li><li><a href=\"https:\/\/www.mysql.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">MySQL<\/a><\/li><li><a href=\"https:\/\/www.microsoft.com\/en-us\/sql-server\/sql-server-2019\" target=\"_blank\" rel=\"noreferrer noopener\">Microsoft SQL Server<\/a>&nbsp;<\/li><li><a href=\"https:\/\/www.postgresql.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">PostgreSQL<\/a><\/li><\/ul>\n\n\n\n<p>Sin embargo, por muy pr\u00e1ctico que sea SQL, si no se emplea adecuadamente puede suponer un problema grave de seguridad.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfQu\u00e9 es la inyecci\u00f3n de c\u00f3digo SQL?<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-la-inyeccion-SQL-1024x512.png\" alt=\"Qu\u00e9 es la inyecci\u00f3n de c\u00f3digo SQL.\" class=\"wp-image-9211\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-la-inyeccion-SQL-1024x512.png 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-la-inyeccion-SQL-300x150.png 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-la-inyeccion-SQL-768x384.png 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-la-inyeccion-SQL-600x300.png 600w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/03\/que-es-la-inyeccion-SQL.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>El m\u00e9todo de ataque de <strong>inyecci\u00f3n de SQL<\/strong> es uno de los tipos de ciberataques m\u00e1s antiguos y utilizados. Si el desarrollador web no ha sido meticuloso, o no ha empleado los m\u00e9todos correctos para realizar las consultas SQL a la hora de desarrollar el sitio web, puede dejar un resquicio de seguridad que los atacantes puede aprovechar.<\/p>\n\n\n\n<p>El m\u00e9todo consiste en a\u00f1adir c\u00f3digo SQL en lugares en los que se espera que el desarrollador web haya empleado este lenguaje de programaci\u00f3n para realizar consultas u otro tipo de acciones relacionadas con la base de datos. Por ejemplo, durante el proceso de inicio de sesi\u00f3n, se emplean consultas a una base de datos. En ese momento, es posible a\u00f1adir c\u00f3digo SQL de modo que el inicio de sesi\u00f3n siempre sea efectivo, aunque el usuario y la contrase\u00f1a no existan, de este modo, el atacante podr\u00eda llegar a acceder a la plataforma, o incluso a la base de datos.<\/p>\n\n\n\n<p>Por ello, a la hora de desarrollar consultas SQL hay que emplear buenas pr\u00e1cticas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Como prevenir la inyecci\u00f3n SQL en PHP<\/h2>\n\n\n\n<p>Hay varias practicas \u00fatiles a emplear para evitar la inyecci\u00f3n de SQL, veamoslas.<\/p>\n\n\n\n<p>Sanear los datos de entrada con los filtros nativos de PHP, por ejemplo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/para Strings\n$cadena= filter_var($nombre, FILTER_SANITIZE_STRING);\n\n\/\/para Email\n$email= filter_var($email, FILTER_SANITIZE_EMAIL);\n\n\/\/para Integers\n$numero = filter_var($numero, FILTER_SANITIZE_NUMBER_INT);<\/code><\/pre>\n\n\n\n<p><strong>Usar consultas pre-compiladas<\/strong>. Este tipo de consultas evitan que el usuario pueda a\u00f1adir c\u00f3digo SQL ya que la consulta se compila previamente y no puede ser alterada. Por ejemplo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Conexi\u00f3n\n$mysqli = new mysqli(\"mihost\", \"usuario\", \"contrase\u00f1a\", \"basedatos\");\n\n$username = $_POST&#91;\"usuario\"];\n$pass = $_POST&#91;\"contrase\u00f1a\"];\n\n$sentencia = $mysqli-&gt;prepare(\"SELECT * \n      FROM usuarios \n      WHERE username = ? \n      AND password = ?\");\n$sentencia-&gt;bind_param(\"ss\", $username, $pass);\n$sentencia-&gt;execute();<\/code><\/pre>\n\n\n\n<p>Emplear usuarios de base de datos con los privilegios estrictamente necesarios. Si a la hora de realizar la conexi\u00f3n a la base de datos usamos un usuario que solamente pueda consultar informaci\u00f3n, podemos evitar que los atacantes inyecten c\u00f3digo SQL de borrado de tablas, o de inserci\u00f3n de nueva informaci\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusi\u00f3n<\/h2>\n\n\n\n<p>Aunque la mayor\u00eda de las plataformas de hoy en d\u00eda est\u00e1n preparadas contra la inyecci\u00f3n de SQL,  sigue siendo un problema cuando se emplean plugins o m\u00f3dulos de terceros, ya que pueden tener fallos de seguridad. Esto tambi\u00e9n puede ser un problema en sitios o aplicaciones web desarrolladas desde cero.<\/p>\n\n\n\n<p>Siempre hay que tener cuidado a la hora de procesar la entrada del usuario y realizar las validaciones pertinentes.<\/p>\n\n\n\n<p>En Caronte Web Studio <a href=\"https:\/\/carontestudio.com\/diseno-web\/diseno-web-vitoria\">desarrollamos sitios web<\/a> empleando este tipo de pr\u00e1cticas seguras, si est\u00e1s interesado puedes contactar con nosotros.<\/p>\n\n\n\n<div class=\"wp-block-columns sabermas is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/carontestudio.com\/blog\/amp-en-2022-que-es-amp-y-para-que-sirven\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/que-es-amp-1024x604.jpg\" alt=\"Qu\u00e9 es AMP y para qu\u00e9 sirve\" class=\"wp-image-8821\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/que-es-amp-1024x604.jpg 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/que-es-amp-300x177.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/que-es-amp-768x453.jpg 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/que-es-amp.jpg 1250w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/carontestudio.com\/blog\/listado-de-propiedades-css\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/listado_de_propiedades_css-1-1024x604.jpg\" alt=\"Listado completo de propiedades CSS.\" class=\"wp-image-8918\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/listado_de_propiedades_css-1-1024x604.jpg 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/listado_de_propiedades_css-1-300x177.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/listado_de_propiedades_css-1-768x453.jpg 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/02\/listado_de_propiedades_css-1.jpg 1250w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Las bases de datos se han convertido en algo esencial para organizar y distribuir la informaci\u00f3n de cualquier entorno inform\u00e1tico. SQL se ha convertido en la forma m\u00e1s com\u00fan de gestionar una base de datos, por ello es esencial saber qu\u00e9 es SQL y como emplearlo de forma segura.<\/p>\n","protected":false},"author":21,"featured_media":9216,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[50],"tags":[],"class_list":["post-8999","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programacion-web"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C\u00f3mo evitar inyecci\u00f3n de SQL en PHP - Blog - Dise\u00f1o WEB &amp; SEO<\/title>\n<meta name=\"description\" content=\"La inyecci\u00f3n de SQL es uno de los tipos de ciberataques m\u00e1s antiguos y utilizados, descubre como evitarlo en tu sitio web.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/carontestudio.com\/blog\/como-evitar-inyeccion-de-sql-en-php\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00f3mo evitar inyecci\u00f3n de SQL en PHP - 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