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CHAPTER 16: Server Security
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DHX: Diffe-Hellman exchange, used extensively for communications of proprietary protocols, such as the Apple File Protocol, and services such as those serving directory service clients (i.e., the Workgroup Manager application). MS-CHAPv2: Microsoft Challenge Access Protocol, typically used for the Apple Point-to-Point Tunneling Protocol (PPTP) Virtual Private Network (VPN) server. WEBDAV-Digest: Used for authenticating user sections of a web site, known as realms, when connecting with a standard web browser or Web Distributed Authoring and Versioning (WebDAV) client such as the Mac OS X Finder s Connect to Server dialog box. APOP: Authenticated Post Office Protocol, a legacy option held over from the standard. Cyrus SASL libraries: Used for IMAP. You can enable and disable authentication methods via the Server Admin s Open Directory service on the Authentication sub-tab of the Policy tab, as shown in Figure 16 9.
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Figure 16 9. Password authentication methods
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Disable any authentication methods that are not required in your environment. For example, in the likely event that you do not support Windows 95 clients in your environment, you can prudently disable the option for LAN Manager. If you do not have
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CHAPTER 16: Server Security
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VPN enabled, then disable the option for MS-CHAP. If you are not using POP3, then disable the option for APOP. By disabling the authentication methods that are not being used, you will increase the security of your environment, as leaving these methods open can reduce the strength of password protection in your network. Many other methods are not listed in the GUI, and it is a good idea to go through them and disable the ones you do not need. To configure authentication methods with the command line, use the slapconfig command:
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slapconfig -getauthmechanisms "SMB-LAN-MANAGER" Enabled Hash "CRAM-MD5" Enabled Hash "NTLM" Disabled Hash "APOP" Disabled Plain "TWOWAYRANDOM" Disabled Plain "MS-CHAPv2" Enabled Hash "PPS" Enabled Hash "DHX" Enabled Hash "OTP" Enabled Hash "SMB-NTLMv2" Enabled Hash "WEBDAV-DIGEST" Disabled Plain "SMB-NT" Enabled Hash "DIGEST-MD5" Enabled Hash "GSSAPI" Enabled Hash "KERBEROS_V4" Disabled Hash "CRYPT" Disabled Hash
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NOTE: The command slapconfig is useful for server setup and management scripts, and can be automated using scripts that run on a schedule such as crontab or launchd. To disable authentication methods you do not need, you can use the setauthenticationmethods argument on the slapconfig command. This will allow you to turn off each method you are not using.
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slapconfig -setauthmechanisms APOP off slapconfig -setauthmechanisms WEBDAV-DIGEST off
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NOTE: In previous versions of Mac OS X Server, this functionality was covered by the NeST commands rather than slapconfig. These commands no longer function in Mac OS X Server 10.6.
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Securing LDAP by Preventing Anonymous Binding
In the previous section, we discussed the Require Clients to Bind to Directory option, but it is important to note that it affects only automatically configured clients. When this
CHAPTER 16: Server Security
option is enabled, no changes are made to the running LDAP process (slapd). This option enables a preference key in the Open Directory client configuration container cn=config. This preference key will be enforced on Mac OS X clients that read this record (but not on most flavors of Linux or Unix). You can view this client configuration record using dscl:
dscl /LDAPv3/127.0.0.1/ -read Config/macosxodpolicy
When the setting is enabled, you will see the Binding Required key set to true when you review the output of dscl. However, because only Mac OS X clients read this configuration, they are the only LDAP clients that are actually required to bind. In other words, you are not restricting access to your LDAP server; you are in fact requiring binding only for clients that use the Max OS X LDAP plug-in. A standard LDAP browser from a rogue machine can anonymously bind even with this option enabled. If you wish to restrict access to only authenticated users, you must add the bind_anon option to the top of the OpenLDAP configuration file stored at /private/etc/openldap/slapd.conf. NOTE: Be aware that configuring slapd to refuse anonymous connections means all clients will be required to bind. This includes the Open Directory master, which is automatically configured with the local host value 127.0.0.1 upon its promotion to an Open Directory master. You will need to update this and all other entries before clients will be able to access the database. Once connected, test that your binding is working by running the following command:
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