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A nice thing about this example PAM configuration file is that it first sees whether the LDAP server can be used to authenticate to the network. The default Linux login mechanism is used only if this procedure doesn t work. The workings of this default mechanism are defined from the fifth line on in the example configuration file. By default, many services on Ubuntu Server are PAM-enabled. (You can see this from a simple ls command in the directory /etc/pam.d, which will show you that there is a PAM file for login, su, sudo, and many other programs. I won t cover all of them here, but will explain a bit about some when the time is relevant.) The true flexibility of PAM is in its modules, which you can find in /lib/security. Each of these modules has a specific function. The next section provides a short description of some of the more interesting modules. But, before we dive into that, you ll quickly learn how to set a secure default policy.
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In a PAM environment, every service should have its own configuration for PAM. However, the world isn t perfect, and a given service may not have a PAM configuration. In this case, I recommend creating /etc/pam.d/other as a PAM configuration file. This file is processed by all PAM applications that don t have their own configuration file. If you really want to know whether your system is secure, give it the contents detailed in Listing 5-11. Listing 5-11. Configuring PAM for Security in /etc/pam.d/other auth auth account account password password session session required required required required required required required required pam_warn.so pam_deny.so pam_warn.so pam_deny.so pam_warn.so pam_deny.so pam_warn.so pam_deny.so
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CHAPTER 5 CONFIGURING YOUR SERVER FOR SECURITY
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All four phases in the authentication process call two modules: pam_warn and pam_deny. The pam_warn module generates a warning and writes that to your log environment (/var/log/ messages by default). Next, for all these instances, the module pam_deny is called. This simple module will just deny everything. The results All modules will handle authentication properly, as defined in their own configuration file, but when that file is absent, this generic configuration will make sure that all access is denied.
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Want to know if a program is PAM-enabled Use ldd programname. For example, use ldd Tip /usr/bin/passwd to find the library files used by this command. If the modules libpam_misc and libpam
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are listed, the module is PAM-enabled. And so it should have its own configuration file for handling user authentication.
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The usefulness of a system like PAM is entirely determined by its modules. Some of these modules are still experimental, and others are pretty mature and can be used to configure a Linux system. I ll discuss some of the most important modules in the following sections.
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pam_deny
As seen in Listing 5-11, the pam_deny module can be used to deny all access. It s very useful if used as a default policy to deny access to the system.
pam_env
The module pam_env is used to create a default environment for users when logging in. In this default environment, several system variables are set to determine what the environment a user is working in looks like. For example, there is a definition of a PATH variable in which some directories are included that must be in the search path of the user. To create these variables, pam_env uses a configuration file in /etc/security/pam_env.conf. In this file, several variables are defined, each with its own value to define essential items like the PATH environment variable.
pam_limits
Some situations require an environment in which limits are set to the system resources that a user can access. Think, for example, of an environment in which a user can use no more than a given number of files at the same time. To configure these limitations, you would modify the /etc/security/limits.conf file. To make sure that the limitations that you set in /etc/ security/limits.conf are applied, use the pam_limits module. In /etc/security/limits.conf, limits can be set for individual users as well as groups. The limits can be applied to different items, some of which are listed here: fsize: Maximum file size nofile: Maximum number of open files
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