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The requisite flag indicates that the module result must be successful for authentication to be successful Additionally, unlike the required flag, the success or failure of this module will be immediately notified to the service requesting authentication, and the authentication process will complete This means that if any modules are stacked together and a module with a requisite control flag fails, then the modules remaining to be processed will not be executed But with the required control flag, the remaining modules in the stack would continue to be processed The next control flag is sufficient The sufficient flag means that the success of this module is sufficient for the authentication process to be successful or if modules are stacked for the stack to succeed This is dependent on no other required modules, processed prior to this module, failing If a sufficient module fails, then the overall stack does not fail.

The last control flag is optional An optional module is not critical to the overall success and failure of the authentication process or the module stack Its success or failure will not determine the success or failure of the overall authentication process The next directive from Listing 1-37, pam_unixso, indicates what PAM module will be used and its location If you specify a PAM module without a path such as shown in Listing 1-37, then the module is assumed to be located in the /lib/security directory You can also specify a module from another location here by providing the path to it, as you can see in the following line: auth required /usr/local/pamlib/pam_localso id=-1 root=1.

The last directive from Listing 1-37, nullok, is an argument to be passed to the PAM module. In the previous line, for example, you can see two arguments, id=-1 and root=1, being passed to the module pam_local.so. Most modules will ignore invalid or incorrect arguments passed to them, and the module will continue to be processed though some modules do generate an error message or fail.

s You can find documentation on your Red Hat system for PAM and all the PAM modules supplied with Tip the pam RPM at /usr/share/doc/pam-version/txts, replacing version with the version number of your pam RPM, or at http://www.kernel.org/pub/linux/libs/pam/.

Thread.Yield()

As I mentioned earlier, you can stack modules for processing, with multiple modules being used to authenticate each interface type of a particular service. If modules are stacked, then they are processed in the order they appear in the PAM service configuration file. As you can specify a variety of control flags when stacking modules, it is important to carefully consider how to stack your modules and what dependencies to configure. In Listing 1-38, you will see the Debian login PAM configuration file. Listing 1-38. The Debian Login /etc/pam.d Configuration File password required password required pam_cracklib.so retry=3 minlen=6 difok=3 pam_unix.so use_authtok nullok md5

Here I am first running the pam_cracklib.so module to check the strength of a new or changed password and then the pam_unix.so module. Both are using a control flag of required, which means both modules need to succeed for the password to be successfully changed and both modules would be tested. If you changed the pam_cracklib.so control flag to requisite and the pam_cracklib.so module failed, then the password change process would immediately fail and the pam_unix.so module would not be checked at all. Additionally, if you specified a module as sufficient that was not adequately secure, then if this module check is successful the entire module stack is considered successful and you have authenticated something without adequate authentication. For example: auth sufficient pam_notsosecure.so auth required pam_secure.so In this case, if the check of pamnotsosecure.so was successful, then the authentication process would be halted and authentication would be successful. If this module does not in reality provide a sufficient security check for authentication, then this is a serious security risk. Thus, it is important to ensure you order your modules and control flags in your PAM configuration files. Additionally on Red Hat systems, you can use a special module called pam_stack.so. This module allows you to include another list of modules contained in an external file into a service configuration file. For example, Red Hat systems use a special service called system-auth to

perform the default authentication for most services. In Listing 1-39 you will see the Red Hat service configuration file for the passwd function. Listing 1-39. The Red Hat passwd Function Service Configuration File auth account password password required required required required /lib/security/pam_stack.so service=system-auth /lib/security/pam_stack.so service=system-auth /lib/security/pam_warn.so /lib/security/pam_stack.so service=system-auth