{"id":20385,"date":"2014-12-10T16:31:21","date_gmt":"2014-12-10T15:31:21","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=20385"},"modified":"2023-02-27T14:31:30","modified_gmt":"2023-02-27T14:31:30","slug":"sni-certificati-ssl-condivisi-unico-indirizzo-ip","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/hosting\/sni-certificati-ssl-condivisi-unico-indirizzo-ip\/","title":{"rendered":"SNI: certificati SSL condivisi su un unico indirizzo IP"},"content":{"rendered":"<p>Abbiamo gi\u00e0 avuto modo di esplorare insieme le <a title=\"Certificato SSL per ecommerce, il lucchetto che tranquillizza\" href=\"https:\/\/www.artera.net\/it\/blog\/ecommerce\/certificato-ssl-per-ecommerce\" target=\"_blank\" rel=\"noopener noreferrer\">motivazioni<\/a> che dovrebbero spingerti all&#8217;uso dei <strong>certificati SSL<\/strong>\u00a0sul tuo sito, per garantire la sicurezza dei dati in transito, per infondere fiducia nei clienti del tuo sito e per migliorare il ranking su Google.<\/p>\n<p>Come ho gi\u00e0 avuto modo di spiegarti, l\u2019implementazione di un certificato SSL richiede l\u2019associazione allo stesso di un <strong>indirizzo IP dedicato<\/strong>.<\/p>\n<p>L\u2019onerosit\u00e0 dovuta all\u2019associazione fra un indirizzo IP dedicato e un singolo certificato SSL non pu\u00f2 che ripercuotersi sull\u2019esborso che sostieni nel caso tu decida di proteggere il tuo sito con un certificato SSL. In realt\u00e0, esiste un metodo pi\u00f9 economico, che permette di associare diversi certificati SSL a un unico indirizzo IP, utilizzando l\u2019estensione <strong>SNI (Server Name Indication)<\/strong>, che rappresenta la soluzione al problema, almeno fino al completamento del passaggio all\u2019IPv6.<\/p>\n<h2>Requisiti per l\u2019uso dei certificati SSL SNI<\/h2>\n<p>Prima di capire come funziona il sistema <a href=\"https:\/\/en.wikipedia.org\/wiki\/Server_Name_Indication\" target=\"_blank\" rel=\"noopener\">SNI<\/a>, \u00e8 giusto che si conoscano i requisiti necessari per poterlo implementare. Se non lo si pu\u00f2 implementare, infatti, l&#8217;unica alternativa percorribile rimane comunque quella di un certificato SSL su indirizzo IP dedicato.<\/p>\n<p>Per farla breve, affinch\u00e9 un sistema SNI funzioni:<\/p>\n<ul>\n<li>devi assicurarti che l\u2019utente utilizzi\u00a0<strong>browser e sistema operativo moderni<\/strong> (es. IE 7 solo su Windows Vista o pi\u00f9 recenti, Firefox dalla versione 2.0, Opera dalla 8.0, Opera Mobile dalla 10.1, Google Chrome su tutte le piattaforme Windows e Mac OS X, Konqueror dalla versione 4.7, Safari);<\/li>\n<li>devi usare il protocollo <strong>OpenSSL dalla versione 0.9.8f<\/strong> e aver implementato l\u2019opzione <strong>TLS Extensions<\/strong>, abilitata di default dalla versione 0.9.8k;<\/li>\n<li>devi avere un server che implementi le\u00a0versioni di un\u00a0<strong>web server che supportino SNI<\/strong> (es. Apache dalla versione 2.2.12, Nginx, Litespeed dalla 4.1, IIS dalla 8);<\/li>\n<li>e, nello specifico, devi assicurarti che il web server Apache supporti<strong>\u00a0OpenSSL in runtime<\/strong>, con l\u2019impostazione LD_LIBRARY_PATH.<\/li>\n<\/ul>\n<h2>Come funziona la tecnologia SNI (Server Name Indication Apache)<\/h2>\n<p>Perch\u00e9 tutto questo? Queste condizioni sono necessarie perch\u00e9 l\u2019estensione SNI permette a diversi certificati SSL di lavorare sullo <strong>stesso indirizzo IP<\/strong> e sulla <strong>medesima porta TCP<\/strong>, garantendo cos\u00ec una connessione protetta senza sprechi. In questo modo, si attua la condivisione del solo indirizzo IP, mentre si mantiene l\u2019indipendenza dei certificati SSL associati ai diversi siti web da proteggere.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-20388 size-full\" title=\"SNI, i certificati SSL condivisi su un unico indirizzo IP\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2014\/12\/certificati-ssl-sni.jpg\" alt=\"SNI, i certificati SSL condivisi su un unico indirizzo IP\" width=\"580\" height=\"317\" \/><\/p>\n<p>A differenza di quanto avviene nella comunicazione del browser con il protocollo SSL\/TLS classico, con l&#8217;SNI il browser comunica subito al server web quali sono i nomi delle risorse e del dominio a vuole collegarsi, permettendo cos\u00ec al server di individuare il <strong>certificato SSL giusto<\/strong>, indipendentemente dall\u2019indirizzo IP.<\/p>\n<p>Questo sistema \u00e8 nettamente diverso da quanto avviene con un certificato SSL tradizionale su IP dedicato. Infatti, quando un utente visita il tuo sito web protetto da <strong>certificato SSL\/TLS<\/strong> (Transport Layer Security) con il suo browser, il programma si connette al server su cui sono ospitate le tue pagine web o le tue applicazioni, e, prima di comunicare al server stesso quale risorse vuole visitare, richiede un certificato digitale di autenticit\u00e0.\u00a0Il server rilascia i dati del certificato e il browser verifica che la firma digitale sia valida e, soprattutto, che sia riconosciuta da una <strong>autorit\u00e0 certificatrice<\/strong> (CA o Certificate Authority) ricorrendo alla decifratura delle informazioni attraverso una chiave a uso pubblico. Verificata l\u2019<strong>autenticit\u00e0 del certificato<\/strong> e la corrispondenza al server anche attraverso l\u2019identificazione dell\u2019indirizzo IP dedicato, il browser verifica che nel contenuto cifrato vi siano le risorse richieste dall\u2019utente e se quest\u2019ultima verifica va a buon fine, la connessione procede normalmente.<\/p>\n<p>Insomma, con i certificati SNI, si evitano tutti i passaggi previsti per la tecnologia SSL\/TLS e si garantisce economicit\u00e0 senza degradare l&#8217;aspetto sicurezza.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019implementazione di un certificato SSL richiede l\u2019associazione allo stesso di un indirizzo IP dedicato. In attesa del passaggio all\u2019IPv6 si potrebbe protendere per una soluzione di certificati SSL condivisi che operino tramite <strong>tecnologia SNI<\/strong>.<\/p>\n","protected":false},"author":4,"featured_media":20474,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[32],"tags":[259,241,72,55],"class_list":["post-20385","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting","tag-certificati-ssl","tag-dati-sensibili","tag-e-commerce","tag-sicurezza"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SNI (Server Name Indication): certificati SSL condivisi su unico IP (Apache) - Artera<\/title>\n<meta name=\"description\" content=\"Possono i certificati SSL lavorare senza un indirizzo IP dedicato? 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