Tomcat app authz example: /usr/local/tomcat/webapps/ROOT/WEB-INF/web.xml

web.xml

<!-- /usr/local/tomcat/webapps/ROOT/WEB-INF/web.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
      http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
           version="2.5">
    <!-- Authorization section starts here -->
    <security-role>
        <role-name>admin</role-name>
    </security-role>
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Whole app</web-resource-name>
            <url-pattern>/*</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <role-name>admin</role-name>
        </auth-constraint>
    </security-constraint>

    <login-config>
        <auth-method>BASIC</auth-method>
    </login-config>
</web-app>

/usr/local/tomcat/conf/tomcat-users.xml