Posts tagged ‘ADS’

JAAS with active directory authentication in a web application

This is a sample to use JAAS authentication with a windows active directory server. I use a Sun Java System Application Server, so the steps with other servers could be different.

Step 1: Defining LDAP realm

In this example you must define a LDAP realm named «ads-realm» with the following parameters:

Realm class:

com.sun.enterprise.security.auth.realm.ldap.LDAPReam

Properties:

directory            = ldap://ads.host.name:389
base-dn              = DC=ads,DC=domain,DC=com
search-bind-dn       = user
search-bind-password = password
search-filter        = (&(objectClass=user)(sAMAccountName=%s))
group-search-filter  = (&(objectClass=group)(member=%d))
jaas-context         = ldapRealm

You must change directory, base-dn, search-bind-dn and search-bind-password to your active directory configuration. The «search-bind-dn» and «search-bind-password» parameters are needed, because with default settings active directory doesn't allow anonymous users to browse the directory.

Step 2: Setting the following JVM Switch for refferals

The following JVM switch is needed with active directory LDAP servers:

-Djava.naming.referral=follow

Add this switch to your server startup script or with the admin console.

Step 3a: Basic authentication

Add the following section to your web.xml or go to Step 3b for form
based authentication.

<login-config>
  <auth-method>BASIC</auth-method>
  <realm-name>ads-realm</realm-name>
</login-config>

Step 3b: Form based authentication

Add the following section to your web.xml:

<login-config>
  <auth-method>FORM</auth-method>
  <realm-name>ads-realm</realm-name>
  <form-login-config>
    <form-login-page>/login.html</form-login-page>
    <form-error-page>/login.html</form-error-page>
  </form-login-config>
</login-config>

Create the page /login.html with a least the following code:

<html>
  <head/>
  <body>
    <form action="j_security_check" method="post">
      Username: <input type="text" name="j_username"><br/>
      Password: <input type="password" name="j_password"><br/>
      <input type="submit" value="Login"/>
    </form>
  </body>
</html>

Step 4: Adding security role to web.xml

Add at least one security role to your web.xml, in this example «userRole».

<security-role>
  <role-name>userRole</role-name>
</security-role>

Step 5: Adding security constraint to web.xml

Now we must create a security constraint and the path to the pages we want to allow only authenticated access. In this sample the access to the folder /pages/ is resticted to authenticated users in role «userRole».

<security-constraint>
  <display-name>SecurityConstraint</display-name>
  <web-resource-colletion>
    <web-resource-name>SecuredFolder</web-resource-name>
      <url-pattern>/pages/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>userRole</role-name>
    </auth-constraint>
  <user-data-constraint>
    <transport-guarantee>NONE</transport-guarantee>
  </user-data-constraint>
</security-constraint>

Step 6: Create role mapping between active directory group and role

Role mappings are defined in sun-web.xml for the Sun Java System Application Server, so add the following section:

<security-role-mapping>
  <role-name>userRole</role-name>
  <group-name>users</group-name>
</security-role-mapping>

This maps the active directory group «users» to our role «userRole»,
so only users in the group «users» can access our secured folder.