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Once you have verified that your server can access your authenticated LDAP server, you are ready to disallow anonymous binding. Edit the slapd configuration tool using your favorite text editor: sudo nano /private/etc/openldap/slapd.conf Add the following disallow bind_anon near the top of the file: # # See slapd.conf(5) for details on configuration options. # # This file should NOT be world readable. # disallow bind_anon Next, save the configuration file, and restart the LDAP service by sending it a HUP signal using the following command: sudo killall -HUP slapd
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Securely Binding Clients to Open Directory
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Once you have set up Open Directory on the server, you can now bind the individual client workstations to the directory service. At this point, all the password policies are enforced, and many of the services communications will be Kerberized. So, why move forward with binding clients If client workstations are not bound, then workstation policies will not be enforced. This includes pushing out Software Update Server settings, mobility and network home folder settings, and any of the managed preferences you may have defined. Also, usernames and passwords for workstations would not be centralized, which is a key to effectively managing and securing larger numbers of systems. To implement the managed preferences settings by binding the client workstations, use the open Directory Utility (Directory Access Utility for Tiger Users) from the client workstation, and click the lock to authenticate as an administrative user. Once you have authenticated, click the plus sign, and choose Open Directory from the Add a New Directory of Type drop-down menu (see Figure 13-10). (In Tiger, you will need to click LDAPv3 on the Services tab, and click the Configure button.) Next, type in the IP address of the Open Directory server, and click OK.
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Figure 13-10. Binding to Open Directory If you are implementing an SSL certificate, check the Encrypt Using SSL box here. We will explain setting up SSL certificates later in this chapter. Once you have added the server, you will want to apply the same security settings that you applied when securing the Open Directory master under the binding policies. To do this, click the Services icon in the Directory Utility toolbar, and click the Open Directory Master server (named ODM in Figure 13-11). Once you click the appropriate server, click Edit to change the settings. Here you can choose the items that correspond with the setup of your Open Directory master where appropriate using the Security Policy section of the screen (see Figure 13-12). When connected, the title of the window should reflect the hostname of the connected server. If it does not obtain direct access to the server using the local Directory Access application, then the title will not be displayed properly.
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Figure 13-11. Choosing a directory service to configure
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Figure 13-12. Configure service security
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Note For LDAPv2 compatibility, update the LDAPv2 plug-in to version 1.2 or greater. The source code for
this is available at http://www.opensource.apple.com/cgi-bin/registered/cvs/DSLDAPPlugIn/ LDAPv2/.
Further Securing LDAP: Implementing Custom LDAP ACLs
An access control list for LDAP is a way to push out security for the OpenLDAP database. This is secure, because it enforces who can access and change things in the LDAP database. ACL policies are enforced at the server level. If ACLs are not configured, you can use LDAP data to access information about network layouts, users, and other information without authentication. One form of this kind of policy is to use the Force Clients to Bind option in the Open Directory policy settings in Server Admin. But beyond this, you will need to jump into the command line to create these ACLs.
Note You can use ldapsearch from the command line to search LDAP databases without authenticating.
To restrict bound users from viewing attributes of other users, use this series of commands: Access by by Access by to dn=".*,dc=your dcname,dc=.com" attr=userPassword self write * auth to dn=".*,dc=your dcname,dc=.com" * read
To fully disable anonymous reads, use this series of commands: Access to dn=".*,dc=your dcname,dc=.com" by dn"uid=nssldap,ou=people,dc=dcname,dc=com" read by * none To restrict access to an LDAP database and allow users to change their own LDAP information in the shared address book, you would add an LDAP ACL to your slapd.conf file. To add an ACL to your slapd.conf, add a series of lines that look similar to the following (we will go into further detail on LDAP ACLs later in this chapter): access to attrs=mail,sn,givenName,telephoneNumber,mobile,facsimileTelephoneNumber,street, postalAddress,postOfficeBox,postalCode,password by self write
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