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The syntax for the main configuration file is as follows. PAM will ignore the file if the directory exists. The main configuration file for PAM is /etc/pam.conf and the /etc/pam.d/ directory contains the PAM configuration files for each PAM-aware application/services.
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Libpam.so.0 => /lib/x86_64-linux-gnu/libpam.so.0 (0x00007effddbe2000) How to Configure PAM in Linux To find out if a program is “ PAM-aware” or not, check if it has been compiled with the PAM library using the ldd command.įor example sshd: $ sudo ldd /usr/sbin/sshd | grep libpam.so To employ PAM, an application/program needs to be “ PAM aware“ it needs to have been written and compiled specifically to use PAM. For instance an accidental deletion of a configuration file(s) under /etc/pam.d/* and/or /etc/pam.conf can lock you out of your own system! Erroneous configuration can disable access to your system partially, or completely. PAM has the potential to seriously alter the security of your Linux system.You don’t necessarily need to understand the internal working of PAM. As a system administrator, the most important thing is to master how PAM configuration file(s) define the connection between applications (services) and the pluggable authentication modules (PAMs) that perform the actual authentication tasks.
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In this article, we will explain how to configure advanced PAM in Ubuntu and CentOS systems.īefore we proceed any further, note that: Many modern Linux distributions support Linux-PAM (hereinafter referred to as “ PAM”) by default. This allows developers to write applications that require authentication, independently of the underlying authentication system. It integrates multiple low-level authentication modules into a high-level API that provides dynamic authentication support for applications. Linux-PAM (short for Pluggable Authentication Modules which evolved from the Unix-PAM architecture) is a powerful suite of shared libraries used to dynamically authenticate a user to applications (or services) in a Linux system.