{"id":4244,"date":"2010-08-24T15:50:40","date_gmt":"2010-08-24T13:50:40","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=4244"},"modified":"2023-02-27T14:55:45","modified_gmt":"2023-02-27T14:55:45","slug":"tomcat-securitymanager","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/hosting\/tomcat-securitymanager\/","title":{"rendered":"Tomcat &#038; SecurityManager"},"content":{"rendered":"<h3>Hosting Tomcat<\/h3>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-4269\" style=\"margin:10px 10px 0 0;\" title=\"Hosting Tomcat\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/08\/apache_tomcat_hosting.-Par-0001-TextImage.ParONtextimage.png\" alt=\"Hosting Tomcat\" width=\"130\" height=\"92\" \/>I provider che supportano gli standard web di Java, cio\u00e8 <strong>servlet<\/strong> e <strong>pagine JSP<\/strong>, nella quasi totalit\u00e0 dei casi basano le loro soluzioni su una qualche versione di <strong>Tomcat<\/strong>, configurato in modo che sia condiviso fra pi\u00f9 utenti e web application. Questa modalit\u00e0 operativa \u00e8 sicuramente la pi\u00f9 economica, dato che un&#8217;istanza di Tomcat in genere \u00e8 avida di risorse (sia memoria che CPU), senza contare che se si avesse un&#8217;istanza per utente si arriverebbe velocemente alla saturazione del server, senza per questo avere evidenti benefici dal punto di vista delle prestazioni.<\/p>\n<p>Come possiamo immaginare utilizzare un Tomcat condiviso ha <strong>enormi ricadute dal punto di vista della sicurezza<\/strong>: pensate a cosa succederebbe se un&#8217;applicazione si mettesse ad eseguire codice arbitrario, come modifiche di variabili di sistema, o addirittura lo shutdown del server!<\/p>\n<h3>Configurare il Security Manager<\/h3>\n<p>Per fortuna Tomcat eredita dalla piattaforma Java un meccanismo molto versatile di &#8220;messa in sicurezza&#8221; del codice, il cosiddetto <strong>Security Manager<\/strong>. Esso consiste in un file con estensione <code>.policy<\/code> che indica a quali classi, package o metodi si ha accesso all&#8217;interno della <abbr title=\"Java Virtual Machine\">JVM<\/abbr>. Il file di policy di default fornito con Tomcat \u00e8 <code>conf\/catalina.policy<\/code><\/p>\n<p>Avviare tomcat sotto security manager \u00e8 un&#8217;operazione molto semplice, \u00e8 sufficiente lanciare il server con l&#8217;opzione <code>-security<\/code>:<\/p>\n<p>[bash]$CATALINA_HOME\/bin\/catalina.sh start -security    (Unix)<br \/>\n%CATALINA_HOME%\\bin\\catalina start -security      (Windows)[\/bash]<\/p>\n<h3>Test in locale<\/h3>\n<p>Attivare il security manager non \u00e8 affatto una semplice operazione del tipo &#8220;attivalo e dimenticalo&#8221;, perch\u00e9 una volta attivato la nostra applicazione (e qualsiasi libreria utilizzata) non avr\u00e0 pi\u00f9 accesso ad alcune funzionalit\u00e0 che in un ambiente di sviluppo &#8220;domestico&#8221; diamo quasi per scontate! \u00c8 quindi necessario <strong>testare a fondo l&#8217;applicazione<\/strong> con una configurazione di sicurezza il pi\u00f9 possibile simile a quella di produzione.<\/p>\n<p>I <a title=\"Hosting Java Artera.it\" href=\"https:\/\/www.artera.net\/it\/\" target=\"_blank\" rel=\"noopener noreferrer\">pacchetti di hosting di Artera<\/a> consentono di attivare il supporto alle JSP in modalit\u00e0 condivisa, le modifiche al file di policy sono le seguenti (aggiornate ad <strong>Agosto 2010<\/strong>):<\/p>\n<p>[bash]\/\/ Required for JNDI lookup of named JDBC DataSource&#8217;s and<br \/>\n\/\/ javamail named MimePart DataSource used to send mail<br \/>\npermission java.util.PropertyPermission &quot;java.home&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.naming.*&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;javax.sql.*&quot;, &quot;read&quot;;<br \/>\n\/\/ OS Specific properties to allow read access<br \/>\npermission java.util.PropertyPermission &quot;os.name&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;os.version&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;os.arch&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;file.separator&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;path.separator&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;line.separator&quot;, &quot;read&quot;;<br \/>\n\/\/ JVM properties to allow read access<br \/>\npermission java.util.PropertyPermission &quot;java.version&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vendor&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vendor.url&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.class.version&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.specification.version&quot;,<br \/>\n&quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.specification.vendor&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.specification.name&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vm.specification.version&quot;,<br \/>\n&quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vm.specification.vendor&quot;,<br \/>\n&quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vm.specification.name&quot;,<br \/>\n&quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vm.version&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vm.vendor&quot;, &quot;read&quot;;<br \/>\npermission java.util.PropertyPermission &quot;java.vm.name&quot;, &quot;read&quot;;<br \/>\n\/\/ Required for OpenJMX<br \/>\npermission java.lang.RuntimePermission &quot;getAttribute&quot;;<br \/>\n\/\/ Allow read of JAXP compliant XML parser debug<br \/>\npermission java.util.PropertyPermission &quot;jaxp.debug&quot;, &quot;read&quot;;<br \/>\n\/\/ Precompiled JSPs need access to this package.<br \/>\npermission java.lang.RuntimePermission<br \/>\n&quot;accessClassInPackage.org.apache.jasper.runtime&quot;;<br \/>\npermission java.lang.RuntimePermission<br \/>\n&quot;accessClassInPackage.org.apache.jasper.runtime.*&quot;;<br \/>\n\/\/ Precompiled JSPs need access to this system property.<br \/>\npermission java.util.PropertyPermission<br \/>\n&quot;org.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER&quot;, &quot;read&quot;;[\/bash]<\/p>\n<p>Queste righe vanno a sostituire quelle presenti nella sezione <em>WEB APPLICATION PERMISSIONS<\/em> all&#8217;interno di <em>catalina.policy<\/em>, all&#8217;interno di un unico &#8220;grant&#8221;:<\/p>\n<p>[bash]\/\/ ========== WEB APPLICATION PERMISSIONS =====================================<\/p>\n<p>\/\/ These permissions are granted by default to all web applications<br \/>\n\/\/ In addition, a web application will be given a read FilePermission<br \/>\n\/\/ and JndiPermission for all files and directories in its document root.<br \/>\ngrant {<\/p>\n<p>  [&#8230;.] &amp;lt;=== queste righe vanno sostituite<\/p>\n<p>}[\/bash]<\/p>\n<h3>E se non funziona?<\/h3>\n<p><strong>Purtroppo non sempre le web application funzionano senza problemi sotto security manager<\/strong>. I problemi maggiori sono dovuti solitamente dalle librerie, sviluppate senza tener conto di un possibile utilizzo in ambienti con restrizioni, ma non \u00e8 raro trovare anche nel proprio codice chiamate a metodi &#8220;proibiti&#8221;.<\/p>\n<p>In alcuni casi sar\u00e0 possibile apportare delle modifiche alle librerie: se si tratta di librerie open source, se si ha molto tempo a disposizione e se sono particolarmente facili da modificare&#8230; condizioni decisamente rare! In tutti gli altri casi bisogner\u00e0 necessariamente <strong>passare ad un pacchetto di hosting superiore<\/strong>, come un <a title=\"Server dedicati Artera per Hosting Java\" href=\"https:\/\/www.artera.net\/it\/blog\/hosting-domini\/server-cloud-vps-o-server-dedicato-quale-scegliere\/\" target=\"_blank\" rel=\"noopener noreferrer\">server dedicato<\/a> (virtuale o meno), dove sar\u00e0 possibile configurare con molta libert\u00e0 ogni parametro di funzionamento e dedicare l&#8217;intero Tomcat alle proprie applicazioni, senza doversi preoccupare delle restrizioni del security manager.<\/p>\n<h3>Link<\/h3>\n<ul>\n<li><a href=\"http:\/\/tomcat.apache.org\/tomcat-5.5-doc\/security-manager-howto.html\">documentazione ufficiale del Security Manager (Tomcat 5.5).<\/a><\/li>\n<li>Permissions in the Java\u2122 SE 6 Development Kit (JDK)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-4269\" title=\"Hosting Tomcat\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/08\/apache_tomcat_hosting.-Par-0001-TextImage.ParONtextimage.gif\" alt=\"Hosting Tomcat\" width=\"130\" height=\"92\" style=\"margin:10px 10px 0 0;\"\/>I provider che supportano gli <strong>standard web di Java<\/strong>, cio\u00e8 servlet e pagine JSP, nella quasi totalit\u00e0 dei casi basano le loro soluzioni su una qualche <strong>versione di Tomcat<\/strong>, configurato in modo che sia condiviso fra pi\u00f9 utenti e <strong>web application<\/strong>. Vediamo come gestire la sicurezza in questa modalit\u00e0.<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[32],"tags":[172,173,174,55,175],"class_list":["post-4244","post","type-post","status-publish","format-standard","hentry","category-hosting","tag-java","tag-jsp","tag-servlet","tag-sicurezza","tag-tomcat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 Tomcat &amp; SecurityManager - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Tomcat &amp; SecurityManager. Contattaci per una partnership! 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