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With LDAP, you can also more carefully control the kind of information given out and to whom. Using a PAM module (pam_ldap), LDAP can perform user authentication tasks, providing centralized authentication for users. Login operations that users perform for different services such as mail POP server, system login, and Samba logins can all be carried out through LDAP using a single PAM-secured user ID and password. To configure PAM to use LDAP, use the System Settings Authentication tool (authconfig-gtk) and select Enable LDAP Support on the Authentication panel. You should also make sure that LDAP server is correctly specified. To use LDAP for authentication, you need to configure PAM to use it, as well as migrate authentication files to the LDAP format. The /usr/share/openldap/migration directory holds scripts you can use to translate the old files into LDAP versions.
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With the libnss_ldap module, LDAP can also be used in the Name Service Switch (NSS) service along with NIS and system files for system database services like passwords and groups. Clients can easily enable LDAP for NSS by using the System Settings Authentication tool and selecting Enable LDAP Support in the User Information panel. You also need to make sure that the LDAP server is specified. You could also manually add ldap for entries in the /etc/nsswitch.conf file.
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To better secure access to the LDAP server, you should encrypt your LDAP administrator s password. The LDAP administrator is specified in the rootdn entry, and its password in the rootpw entry. To create an encrypted password, use the slappasswd command. This prompts you for a password and displays its encrypted version. Copy that encrypted version in the rootpw entry.
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Pluggable Authentication Modules (PAM) is an authentication service that lets a system determine the method of authentication to be performed for users. In a Linux system, authentication has traditionally been performed by looking up passwords. When a user logs in, the login process looks up their password in the password file. With PAM, users requests for authentication are directed to PAM, which in turn uses a specified method to authenticate the user. This could be a simple password lookup or a request to an LDAP server, but it is PAM that provides authentication, not a direct password lookup by the user or application. In this respect, authentication becomes centralized and controlled by a specific service, PAM. The actual authentication procedures can be dynamically configured by the system administrator. Authentication is carried out by modules that can vary
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according to the kind of authentication needed. An administrator can add or replace modules by simply changing the PAM configuration files. See the PAM Web site at www.kernel.org/pub/linux/libs/pam for more information and a listing of PAM modules. PAM modules are located in the /lib/security directory.
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PAM Configuration Files
On Red Hat, PAM uses different configuration files for different services that request authentication. Such configuration files are kept in the /etc/pam.d directory. For example, you have a configuration file for logging in to your system (/etc/pam.d/login), one for the graphical login (/etc/pam.d/gdm) and one for accessing your Samba server (/etc/pam.d/samba). A default PAM configuration file, called /etc/pam.d/other, is invoked if no services file is present. On Red Hat, the system-auth file contains standard authentication modules for system services generated by authconfig-gtk and is invoked in many of the other configuration files. In addition, Red Hat sets up an authentication for its configuration tools, such as redhat-config-services and redhat-config-network.
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PAM Modules
A PAM configuration file contains a list of modules to be used for authentication. They have the following format: module-type control-flag module-path args The module-path is the module to be run, and modulearguments are the parameters you want passed to that module. Though there are a few generic arguments, most modules have their own. The module-type refers to different groups of authentication management: account, authentication, session, and password. The account management performs account verification, checking such account aspects as to whether the user has access, or whether the password has expired. Authentication (auth) verifies who the user is, usually through a password confirmation. Password management performs
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