zebra barcode printer c# 16: Server Security in Objective-C

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CHAPTER 16: Server Security
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Figure 16 7. Configuring global password policies
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Securing Open Directory Using Binding Policies
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Once you have set up Open Directory, to effectively secure client systems and communications between clients and the server, you ll want to secure the actual Open Directory services. The next step after using SSL to secure transport communications is to move on to securing the communications between clients and the server by using binding policies. On the Binding sub-tab of the Open Directory Policy tab (see Figure 16 8), you will find the option to Enable Authenticated Directory Binding. This option is used to give Mac OS X clients a directory administrator s username and password to create a computer record in the Open Directory database, and then enforce a rule that only Mac OS X computers with computer records will be allowed to bind to the directory service. This standard computer record is then associated with a Kerberos principal, though you won t see a difference in the graphical interface. With the Kerberos principal, the client and server can then verify the integrity of their communication with one another.
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CHAPTER 16: Server Security
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Figure 16 8. Binding policies
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Once you have enabled authenticated directory binding, the next step is to force Mac OS X workstations into authenticated, or trusted, binding by selecting the Require Authenticated Binding Between Directory and Clients option. This will require a Mac OS X client to actually bind to the domain rather than just query it for login settings (adding the directory services entry into the search path), which is how an unauthenticated, or untrusted bind, works. Binding to Open Directory increases the security of the network by forcing all clients who log into the server to be bound to the server. Binding options can also enforce more stringent security requirements by forcing client systems to follow certain rules in how they communicate with the server, whether they are Mac OS X clients or an LDAP client from a different operating system. The options listed in the Security field enforce communication policies and include the following: Disable clear text passwords: This forces clients to encrypt data communications to the server. Digitally sign all packets: This places checksums on digital communications. Encrypt all packets: This forces clients to use SSL or Kerberos. Block man-in-the-middle attacks: This option checks to see whether the signatures match the session keys.
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CHAPTER 16: Server Security
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Disable client-side caching: By default, OS X clients cache LDAP information. This option disables this kind of caching in the event that you suspect a client system has been compromised. Allow users to edit their own contact information: If you are not using the Address Book integration with the server, you should disable this option. Users should be allowed to edit their own information in a self-updating address book environment only. When disabled, this option will edit the LDAP-based ACLs, which we will discuss later in this chapter. TIP: Once you have enforced the appropriate binding policies, keep a detailed account of what has been enforced, because the client setup will require the policies you are using to be mirrored in the client configuration.
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Securing Authentication with PasswordServer
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In Open Directory on Mac OS X Server 10.5 and later, the password is stored, by default, in the password database. This is a very secure approach to handling passwords, as they are stored in an encrypted form and somewhat disconnected from LDAP itself. In previous versions of Open Directory, the password could be stored in an encrypted form in the LDAP database. This had the potential to allow any user to cache an encrypted version of the password offline and attempt to crack it with various password-cracking tools. But in Mac OS X 10.5 and later, the location of the password in the password database is referenced in the LDAP database so that passwords cannot be cached and then decrypted at a later date. The password slot is a location in the database of the PasswordServer. By listing the password slot (or slot ID) rather than the password itself, the password is never exposed to end users, and therefore more secure than if it were stored within LDAP. The PasswordServer is used for standard authentication for many services such as the Apple File Protocol. It is based on the Simple Authentication and Security Layer (SASL) standard originally created for the Cyrus e-mail system, but ported into Mac OS X for use with Open Directory. It allows various protocols within Mac OS X Server to communicate with Open Directory while keeping the passwords themselves well encrypted and somewhat obfuscated. In addition to handling standard password requirements, the PasswordServer can also limit the types of passwords that can be used, and has the ability to enforce rules on passwords. These rules include enforcing the quality of passwords that can be used, the frequency of required password resets, and how passwords can be used by various services in Mac OS X. PasswordServer handles password exchanges of the following authentication types: LAN Manager, NTLMv1, and NTLMv2: Mostly used for the Windows File Sharing engine known as SMB. Apple added SASL support for the more modern NTLMv2 password format in version 10.4 of Mac OS X.
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