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Rather than have Samba do the work of maintaining the password space, you can pass this task on to a remote server. The remote server is identified using the password server parameter. Interactions with the remote server can either be in user-level authentication or domain-level authentication modes as designated by a security parameter value of server or domain respectively. Domain-level authentication offers some additional functionality that you'll want to consider when choosing a remote authentication method. Under domain-level authentication, there is no need to duplicate NTLM and UNIX accounts. The Samba server can also participate in domain trust relationships. To join Samba with an exiting domain, begin by stopping the smbd and nmbd daemons on the server. Add the server's NetBIOS name to the domain using Server Manager for Domains on the domain controller (Figure 7.2). On the Samba server, create a server account password for the domain using the smbpasswd command (Example 7.8). The password will be stored in the /usr/local/samba/private directory as file named <Domain Name>.<Samba Name>.mac. The mac file name suffix stands for machine account. Lastly, update the smb.conf configuration file with the parameters and values listed in Table 7.3. The machine password timeout parameter specifies a time value in seconds that causes smbd to periodically regenerate a new server domain password. Restart the smbd and nmbd daemons.
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Figure 7.2: Server manager for domains
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Example 7.8 Creating a Domain Server Password $ smbpasswd j <Domain Name> r <Server NetBIOS Name> Table 7.3: smb.conf Domain Parameters
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security = domain workgroup = <domain name> password server = <PDC BDC1 ... BDCn> encrypt passwords = true machine password timeout = <seconds>
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Alternative Authentication Methods
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In keeping with the spirit of open-source software development, a number of alternative authentication methods have been implemented by Samba users and made available to other Samba aficionados. Some of these authentication methods are packaged as contributed tools, others have found their way back into the Samba distribution. This area of development is a moving target and thus the best source of information are the Samba discussion groups. You can also glean a fair amount of information from the smb.conf(5) man page and the distribution source code. In particular take a close look at the passdb.c and pass_check.c C-language source files located in the distribution
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./source/passdb directory. Samba-supported alternate authentication methods, databases and channels include Kerberos, Network Information Service+ (NIS+), Lightweight Directory Access Protocol (LDAP), MySQL, Distributed Computing Environment (DCE), Pluggable Authentication Module (PAM), GINAs (replaceable NT authentication modules), and Secure Sockets Layer (SSL). Of particular note is PAM functionality. PAM provides a consistent interface for implementing alternate authentication systems through the use of shared libraries and a well-defined PAM configuration table, /etc/pam.d/login. Administrators can easily change the authentication method by adding/removing libraries and updating the PAM configuration table (Example 7.9). Example 7.9 Sample PAM Configuration Table Service module_type login auth login auth use_first_pass login auth use_mapped_pass module_path required required optional options pam_smb _auth.so pam_kerberos.so pam_netware.so
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To address the issue of scaling Samba user namespace for large populations, alternative authentication databases like Kerberos, LDAP, and MySQL are under development. Kerberos 5.0 support is of particular interest in that it is base authentication method in Windows 2000. LDAP is also important, because a growing number of vendors are developing applications that use LDAP to store user validation information, including the Active Directory System in Windows 2000. Table 7.4 lists the experimental parameters available in Samba. Table 7.4 Global Section LDAP Parameters
ldap server ldap port ldap root ldap root password ldap suffix ldap filter SSL
LDAP server DNS name LDAP server port number LDAP bind entity LDAP bind password LDAP distinguished name base Search %u filter
A method to further secure the SMB session channel is provided by incorporating Secure
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Sockets Layer (SSL) into Samba. SSL is technology that uses public-key encryption and X.509 digital certificates to authenticate and secure a communication channel for communication between principals. SSL is commonly used by Web applications that require secure data interchange, like electronic banking. SSL can be added to Samba by building the distribution with SSLeay. SSLeay is a free implementation of the SSL protocol. A copy of SSLeay can be obtained from ftp://ftp.psy.uq.oz.au/pub/Crypto/SSL. Build and install SSLeay before compiling and linking Samba. Edit the Samba Makefile, uncomment, and tailor the SSL_ROOT definitions listed near the end of the Makefile definitions. Build and install Samba. There are a number of Samba SSL parameters (Table 7.5) that will need to be configured for your installation. See the smb.conf(5) man page and ./textdocs/SSLeay for details on installing, configuring and setting up certificates and keys for Samba SSL support. Once Samba is enabled for SSL, you will need to install SSL CIFS clients on your Windows workstations. A commercial CIFS SSL client called Sharity is available from http://www.obdev.at/Products/Sharity.html. Table 7.5 Global Section SSL Parameters
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