Files in /etc/pam.d/

Rocky Hotas rockyhotas at
Sun Nov 6 10:15:59 UTC 2016

The directory /etc/pam.d/ contains PAM policies for services. Some are pretty clear and unambiguous: /etc/pam.d/sshd is related to the ssh listening service. But some other are not. 
For example: in that directory, "login", "passwd" and "system" refer to very similar fields. So, I would like to ask:
- What exactly is the scope of *each* of them? Does exists a documentation about it?
- What is (if any) the hierarchy followed by them? Let's say that "system" (which contains system-wide login policy) and "sshd" have different statements: which one will prevail?
I have not found an answer to these questions on documentation ( Moreover, nor "man pam.d" neither /etc/pam.d/README contain information about it.


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