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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Catalina Functional Specifications - JDBCRealm</title><meta name="author" value="Craig McClanahan"><meta name="email" value="craigmcc@apache.org"></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../../../images/tomcat.gif" align="right" alt="
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Catalina Functional Specifications
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" border="0"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../../../images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left"><table border="0" width="100%" cellspacing="4"><tr><td align="left" valign="top"><h1>Catalina Functional Specifications</h1><h2>JDBCRealm</h2></td><td align="right" valign="top" nowrap="true"><img src="../../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Overview"><strong>Overview</strong></a></font></td></tr><tr><td><blockquote>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>
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<p>The purpose of the <strong>JDBCRealm</strong> implementation is to
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provide a mechanism by which Tomcat 5 can acquire information needed
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to authenticate web application users, and define their security roles,
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from a relational database accessed via JDBC APIs. For integration
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with Catalina, the resulting class(es) must implement the
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<code>org.apache.catalina.Realm</code> interface.</p>
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<p>This specification reflects a combination of functionality that is
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already present in the <code>org.apache.catalina.realm.JDBCRealm</code>
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class, as well as requirements for enhancements that have been
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discussed. Where appropriate, requirements statements are marked
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<em>[Current]</em> and <em>[Requested]</em> to distinguish them.</p>
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<p>The current status of this functional specification is
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<strong>PROPOSED</strong>. It has not yet been discussed and
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agreed to on the TOMCAT-DEV mailing list.</p>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="External Specifications"><strong>External Specifications</strong></a></font></td></tr><tr><td><blockquote>
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<p>The implementation of this functionality depends on the following
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external specifications:</p>
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<ul>
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<li><a href="http://java.sun.com/products/jdbc/">Java Database
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Connectivity</a> (version 2.0 or later)</li>
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<li><a href="http://java.sun.com/products/jdbc/">Java Database
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Connectivity Optional Package</a> (version 2.0 or later)</li>
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</ul>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Implementation Requirements"><strong>Implementation Requirements</strong></a></font></td></tr><tr><td><blockquote>
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<p>The implementation of this functionality shall conform to the
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following requirements:</p>
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<ul>
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<li>Be realized in one or more implementation classes.</li>
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<li>Implement the <code>org.apache.catalina.Realm</code> interface.
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[Current]</li>
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<li>Implement the <code>org.apache.catalina.Lifecycle</code>
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interface. [Current]</li>
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<li>Subclass the <code>org.apache.catalina.realm.RealmBase</code>
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base class.</li>
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<li>Live in the <code>org.apache.catalina.realm</code> package.
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[Current]</li>
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<li>Support a configurable debugging detail level. [Current]</li>
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<li>Log debugging and operational messages (suitably internationalized)
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via the <code>getContainer().log()</code> method. [Current]</li>
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</ul>
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</blockquote></td></tr></table>
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Dependencies"><strong>Dependencies</strong></a></font></td></tr><tr><td><blockquote>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Environmental Dependencies"><strong>Environmental Dependencies</strong></a></font></td></tr><tr><td><blockquote>
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<p>The following environmental dependencies must be met in order for
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JDBCRealm to operate correctly:</p>
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<ul>
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<li>The desire to utilize JDBCRealm must be registered in
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<code>$CATALINA_HOME/conf/server.xml</code>, in a
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<code><Realm></code> element that is nested inside a
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corresponding <code><Engine></code>, <code><Host></code>,
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or <code><Context></code> element.</li>
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</ul>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Container Dependencies"><strong>Container Dependencies</strong></a></font></td></tr><tr><td><blockquote>
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<p>Correct operation of JDBCRealm depends on the following
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specific features of the surrounding container:</p>
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<ul>
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<li>Interactions with <code>JDBCRealm</code> will be initiated by
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the appropriate <code>Authenticator</code> implementation, based
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on the login method that is selected.</li>
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<li><code>JDBCRealm</code> must have the JDBC standard API classes
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available to it. For a JDK 1.2 or later container, these APIs
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are included in the standard platform.</li>
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<li>When connection pooling is implemented, <code>JDBCRealm</code>
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must have the JDBC Optional Package (version 2.0 or later) APIs
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available to it. This library is available as a separate
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download (and will be included in Tomcat binary distributions).</li>
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</ul>
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</blockquote></td></tr></table>
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Functionality"><strong>Functionality</strong></a></font></td></tr><tr><td><blockquote>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Overview of Operation"><strong>Overview of Operation</strong></a></font></td></tr><tr><td><blockquote>
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<p>The main purpose of <code>JDBCRealm</code> is to allow Catalina to
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authenticate users, and look up the corresponding security roles, from
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the information found in a relational database accessed via JDBC APIs.
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For maximum flexibility, the details of how this is done (for example,
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the names of the required tables and columns) should be configurable.</p>
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<p>Each time that Catalina needs to authenticate a user, it will call
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the <code>authenticate()</code> method of this Realm implementation,
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passing the username and password that were specified by the user. If
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we find the user in the database (and match on the password), we accumulate
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all of the security roles that are defined for this user, and create a
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new <code>GenericPrincipal</code> object to be returned. If the user
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is not authenticated, we return <code>null</code> instead. The
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<code>GenericUser</code> object caches the set of security roles that
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were owned by this user at the time of authentication, so that calls to
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<code>isUserInRole()</code> can be answered without going back to the
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database every time.</p>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Detailed Functional Requirements"><strong>Detailed Functional Requirements</strong></a></font></td></tr><tr><td><blockquote>
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<h3>Configurable Properties</h3>
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<p>The implementation shall support the following properties
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that can be configured with JavaBeans property setters:</p>
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<ul>
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<li>Configuration parameters defining the JDBC driver to use, the
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database connection URL to be accessed, and the username/password
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to use for logging in. [Current]</li>
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<li>Configuration parameters describing the connection pool to be
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created to support simultaneous authentications. [Requested]</li>
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<li>Name of the tables to be searched for users and roles. [Current]</li>
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<li>Name of the columns to be used for usernames, passwords, and
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role names. [Current]</li>
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</ul>
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<h3>Lifecycle Functionality</h3>
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<p>The following processing must be performed when the <code>start()</code>
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method is called:</p>
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<ul>
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<li>Establish a connection to the configured database, using the
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configured username and password. [Current]</li>
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<li>Configure and establish a connection pool of connections to the
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database. [Requested]</li>
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</ul>
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<p>The following processing must be performed when the <code>stop()</code>
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method is called:</p>
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<ul>
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<li>Close any opened connections to the database.</li>
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</ul>
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<h3>Method authenticate() Functionality</h3>
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<p>When <code>authenticate()</code> is called, the following processing
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is required:</p>
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<ul>
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<li>Acquire the one and only connection [Current] or acquire a connection
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from the connection pool [Requested].</li>
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<li>Select the one and only row from the user's table for this user,
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and retrieve the corresponding password column. If zero rows (or
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more than one row) are found, return <code>null</code>.</li>
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<li>Authenticate the user by comparing the (possibly encrypted) password
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value that was received against the password presented by the user.
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If there is no match, return <code>null</code>.</li>
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<li>Acquire a <code>List</code> of the security roles assigned to the
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authenticated user by selecting from the roles table.</li>
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<li>Construct a new instance of class
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<code>org.apache.catalina.realm.GenericPrincipal</code>, passing as
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constructor arguments: this realm instance, the authenticated
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username, and a <code>List</code> of the security roles associated
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with this user.</li>
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<li><strong>WARNING</strong> - Do not attempt to cache and reuse previous
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<code>GenericPrincipal</code> objects for a particular user, because
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the information in the directory server might have changed since the
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last time this user was authenticated.</li>
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<li>Return the newly constructed <code>GenericPrincipal</code>.</li>
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</ul>
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<h3>Method hasRole() Functionality</h3>
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<p>When <code>hasRole()</code> is called, the following processing
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is required:</p>
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<ul>
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<li>The <code>principal</code> that is passed as an argument SHOULD
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be one that we returned (instanceof class
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<code>org.apache.catalina.realm.GenericPrincipal</code>, with a
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<code>realm</code> property that is equal to our instance.</li>
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<li>If the passed <code>principal</code> meets these criteria, check
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the specified role against the list returned by
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<code>getRoles()</code>, and return <code>true</code> if the
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specified role is included; otherwise, return <code>false</code>.</li>
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<li>If the passed <code>principal</code> does not meet these criteria,
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return <code>false</code>.</li>
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</ul>
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</blockquote></td></tr></table>
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Testable Assertions"><strong>Testable Assertions</strong></a></font></td></tr><tr><td><blockquote>
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<p>In addition the the assertions implied by the functionality requirements
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listed above, the following additional assertions shall be tested to
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validate the behavior of <code>JDBCRealm</code>:</p>
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<ul>
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</ul>
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</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
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Copyright © 1999-2006, Apache Software Foundation
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</em></font></div></td></tr></table></body></html>
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