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Access control

Access control. 2/18/2009. TOMCAT Security Model. Declarative Security: the expression of application security external to the application, and it allows runtime configuration Configure in web.xml Programmatic Security:

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Access control

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  1. Access control 2/18/2009

  2. TOMCAT Security Model • Declarative Security: • the expression of application security external to the application, and it allows runtime configuration • Configure in web.xml • Programmatic Security: • implement fine-grained access control, enabling components to become security aware • Involves using HttpServletRequest API method

  3. Declarative Security • the expression of application security external to the application, and it allows runtime configuration • Configure in web.xml

  4. Role-based Authorization • Use role-based authorization to manage access • Define role in /conf/tomcat-user.xml <tomcat-users> <role rolename="tomcat"/> <role rolename="role1"/> <role rolename="user"/> <user username="tomcat" password="tomcat" roles="tomcat"/> <user username="role1" password="tomcat" roles="role1"/> <user username="both" password="tomcat" roles="tomcat,role1"/> <user username="jerry" password="jerry" roles="user"/> </tomcat-users> *Need to restart TOMCAT after reconfiguration.

  5. Role-based Authorization • Define security role in web.xml <security-role> <description>The role that is required to log in to the Manager Application </description> <role-name>user</role-name> </security-role> <security-constraint> <web-resource-collection> <url-pattern> /protected/* </url-pattern> </web-resource-collection> <auth-constraint> <role-name>user</role-name> </auth-constraint> </security-constraint>

  6. Authentication Method – 1: Basic • Usage: • Pop up a dialog box • Browser-based auth • User & Password are sent in every http request • Must exit the browser to logout • Not secure at all (no encryption) • Configuration in web.xml <login-config> <auth-method>BASIC</auth-method> <realm-name>Tomcat Manager Application</realm-name> </login-config>

  7. Authentication Method – 2: Digest • Usage: • Same as BASIC • Username and password are encrypted into a message digest value • Configuration in web.xml <login-config> <auth-method>DIGEST</auth-method> <realm-name>Tomcat Manager Application</realm-name> </login-config> Has to use a secure connection, such as SSL, etc

  8. Authentication Method – 3: Form • Usage: • Define your own login and error page • Authentication is defined in servlet session • Logout by session.invalidate() • Configuration in web.xml <login-config> <auth-method>FORM</auth-method> <form-login-config> <form-login-page>/protected/login.jsp</form-login-page> <form-error-page>/protected/error.jsp</form-error-page> </form-login-config> </login-config>

  9. Authentication Method – 3: Form • Must follow the rules • Use j_username field for the username • Use j_password field for the password • Submit to j_security_check • Login.jsp <form action='j_security_check' method='post'> Name:<input type='text' name='j_username'><br> Password:<input type='password' name='j_password' size='8'><br> <input type='submit' value='login'> </form> • Error.jsp <font size='4' color='red'> The username and password you supplied are not valid.</p> Click <a href='<%= response.encodeURL("login.jsp") %>'>here</a> to retry login

  10. Authentication Method – 4: Client • Usage • implemented with SSL and requires the client to possess a public key certificate • Most secure, but costly

  11. Programmatic Security • implement fine-grained access control, enabling components to become security aware • Involves using HttpServletRequest API method

  12. Access authentication info. • getRemoteUser() • getAuthType() • isUserInRole() • getUserPrincipal() • Principal is an alternated object to identify user • show_security.jsp User principal: <%= request.getUserPrincipal().getName() %>.<br/> User name: <%= request.getRemoteUser() %>.<br/> Request Authenticated with: <%= request.getAuthType() %>.<br/> <% if(request.isUserInRole("user")) { %> You are in <i>user</i> role<br/> <% } %>

  13. Use Role in Web App. Under Structs • Restricted access to Actions • <action path=“……"        type= …… name=……         scope="request"roles="administrator"></action> • In JSP • <logic:present role="administrator"/> ……</logic:present>

  14. Reference • Good security tutorial: http://www.informit.com/articles/article.aspx?p=24253 • Http servlet request APIs: http://www.caucho.com/resin-javadoc/javax/servlet/http/HttpServletRequest.html • http://www.java2s.com/Tutorial/Java/0400__Servlet/0440__Authentication.htm

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