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First up we'll look at how to provide the user with access to the system without having to enter a username/password via Windows integrated authentication. Then we'll look at extending this to also obtain the access levels for the users from the domain.

Debugging

You may want to turn on the logging of the security processing during the setting up of the authentication, since it'd disabled by default.

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Setting up the smbAuthenticationProvider is just a matter of configuring the SmbNtlmAuthenticationProvider with the authorizationProvider provider to be used.

	<bean id="smbAuthenticationProvider" class="org.acegisecurity.providers.smb.SmbNtlmAuthenticationProvider">
		<property name="authorizationProvider">
			<ref local="nullDaoAuthenticationProvider"/>
		</property>
	</bean>

In this case we're referencing yet another item, the nullDaoAuthenticationProvider authentication provider.
The nullDaoAuthenticationProvider is a simple authentication provider that uses a separate UserDetailsService to retrieve the information about what roles a user has, and if you're using the default security.xml file for this that will be the users.properties file.
Alternatively the UserDetailsService could be accessing a database to retrieve the users roles, and later we'll be looking at changing this to use Active Directory (via LDAP) to determine the users roles.

	<bean id="nullDaoAuthenticationProvider" class="org.acegisecurity.providers.smb.NullPasswordDaoAuthenticationProvider">
		<property name="userDetailsService" ref="userDetailsService"/>
		<property name="userCache">
			<bean class="org.acegisecurity.providers.dao.cache.EhCacheBasedUserCache">
				<property name="cache">
					<bean class="org.springframework.cache.ehcache.EhCacheFactoryBean">
						<property name="cacheManager">
							<bean class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"/>
						</property>
						<property name="cacheName" value="userCache"/>
					</bean>
				</property>
			</bean>
		</property>
	</bean>

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	<bean id="ntlmProcessingFilter" class="org.acegisecurity.ui.ntlm.NtlmProcessingFilterIPFilteredNtlmProcessingFilter">
		<property name="defaultDomain"><value>DOMAINNAME</value></property>
		<property name="domainController"><value>172.16.0.30</value></property>
		<property name="authenticationEntryPoint" ref="ntlmEntryPoint"/>
		<property name="authenticationManager" ref="ntlmAuthenticationManager"/>
		<property name="excludedIpAddresses">
			<list>
				<value>192.168.2.0/24</value>
				<value>138.19.19.50</value>
			</list>
		</property>
		<property name="includedIpAddresses">
			<list>
				<value>172.16.0.0/16</value>
			</list>
		</property>
	</bean>

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	<bean id="ntlmProcessingFilterInternal" class="org.acegisecurity.ui.ntlm.NtlmProcessingFilterIPFilteredNtlmProcessingFilter">
		<property name="defaultDomain"><value>INTERNAL</value></property>
		<property name="domainController"><value>172.16.0.30</value></property>
		<property name="authenticationEntryPoint" ref="ntlmEntryPoint"/>
		<property name="authenticationManager" ref="ntlmAuthenticationManager"/>
		<property name="includedIpAddresses">
			<list>
				<value>172.16.0.0/16</value>
			</list>
		</property>
		<property name="defaultRole"><value>ROLE_INTERNAL</value></property>
	</bean>

	<bean id="ntlmProcessingFilterExternal" class="org.acegisecurity.ui.ntlm.NtlmProcessingFilterIPFilteredNtlmProcessingFilter">
		<property name="defaultDomain"><value>EXTERNAL</value></property>
		<property name="domainController"><value>201.20.109.76</value></property>
		<property name="authenticationEntryPoint" ref="ntlmEntryPoint"/>
		<property name="authenticationManager" ref="ntlmAuthenticationManager"/>
		<property name="includedIpAddresses">
			<list>
				<value>201.20.0.0/16</value>
			</list>
		</property>
		<property name="defaultRole"><value>ROLE_EXTERNAL</value></property>
	</bean>

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This information is obtained from an AD domain controller using the LDAP protocol.

To enable LDAP as a source of authentication information the ntlmAuthenticationManager we created earlier needs to be altered to use an LdapAuthenticationProvider rather than the SmbAuthenticationProvider.

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And then setup the new ldapAuthenticationProvider as follows:

	<bean id="ldapAuthenticationProvider" class="org.acegisecurity.ui.ntlm.ldap.authenticator.NtlmAwareLdapAuthenticationProvider">
		<constructor-arg>
			<ref local="authenticatorLdap"/>
		</constructor-arg>
		<constructor-arg>
			<ref local="populatorLdap"/>
		</constructor-arg>
	</bean>

This provider uses two other item to provide information, the authenticationLdap bean and the populatorLdap bean.

The authentication would be configured as follows

The authentication would be configured as follows:

	<bean id="authenticatorLdap" class="org.acegisecurity.ui.ntlm.ldap.authenticator.NtlmAwareLdapAuthenticatorImpl">
		<constructor-arg>
			<ref local="initialDirContextFactory"/>
		</constructor-arg>
		<property name="userSearch">
			<ref local="userSearchLdap"/>
		</property>
	</bean>

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	<bean id="initialDirContextFactory" class="org.acegisecurity.ldap.DefaultInitialDirContextFactory">
		<constructor-arg value="ldap://192.168.0.16:389/"/>
		<property name="managerDn">
			<value>CN=Administrator,OU=Users,DC=cohga,DC=local</value>
		</property>
		<property name="managerPassword">
			<value>password</value>
		</property>
	</bean>

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Here the ip address, manager distinguished name and manager passwords must be set to appropriate values for a user that can read for the active directory server.values for a user that can read for the active directory server.
I've used the Administrator user to connect to LDAP in the example above but you do not want to do that on a production system (and you should be worried if your IT department gives you the password for this user just to do this). Instead you should have IT create a limited user account that you can connect with.

The two final beans, the userSearchLdap and populatorLdap also require information that is specific to the environment you're running within, the userSearchLdap beans would be as followssomething like the following:

	<bean id="userSearchLdap" class="org.acegisecurity.ldap.search.FilterBasedLdapUserSearch">
		<constructor-arg>
			<value>OU=Users,DC=cohga,DC=local</value>
		</constructor-arg>
		<constructor-arg>
			<value>(sAMAccountName={0})</value>
		</constructor-arg>
		<constructor-arg>
			<ref local="initialDirContextFactory" />
		</constructor-arg>
		<property name="searchSubtree">
			<value>true</value>
		</property>
	</bean>

This configuration assumes that there is a branch in the tree matching the first constructor arg and that the sAMAccountName value of any user users found there will match the username they logged into Windows with.

Finally the populatorLdap is responsible for mapping the username to the roles and would be configured as follows

	<bean id="populatorLdap" class="org.acegisecurity.providers.ldap.populator.DefaultLdapAuthoritiesPopulator">
		<constructor-arg>
			<ref local="initialDirContextFactory"/>
		</constructor-arg>
		<constructor-arg>
			<value>OU=UsersWeave,DC=cohga,DC=local</value>
		</constructor-arg>
		<property name="groupRoleAttribute">
			<value>cn</value>
		</property>
		<property name="searchSubtree">
			<value>true</value>
		</property>
		<property name="rolePrefix">
			<value>ROLE_</value>
		</property>
		<property name="convertToUpperCase">
			<value>true</value>
		</property>
		<property name="groupSearchFilter">
			<value>(member={0})</value>
		</property>
		<property name="defaultRole">
			<value>ROLE_USERS</value>
		</property>
	</bean>

This configuration is setup to search for groups and use the member attribute of the group to determine if the user belongs.
This setup is assuming that there has been a security group created in the Active Directory server called Weave and that the roles/groups for Weave are created under there.
This "should" take the active directory groups that the user belongs to and convert them to a format that's usable in Weave, and also assigns a default ROLE_USERS role to all users (which you can remove if it's not appropriate).

You will then need to create Weave Access Control Lists utilising the roles that users will be assigned.

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