FreeBSD and pam_listfile

I’ve discovered unknown terrors while researching and writing PAM Mastery. Well, terrors previously unknown to me, at least. I’m certain that the OpenPAM and Linux-PAM developers are very much aware of them. (I’m also certain that they’re part of the reason DES keeps his hair cut so short, so that he can’t yank it out of his head in bloody chunks.)

Part of the writing process was building a giant spreadsheet listing operating systems, PAM versions, and which modules appear in each OS. Strictl...