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Where does Pam check for possible login errors?
On AIX, PAM checks the /etc/security/user file for possible login errors, even when running the minimum stack. PAM checks this file independent of any special directives in the stack. The following error might occur when you run the ./ValidateUser command:
What is the use of pam listfile.so?
Use of pam_listfile.so module. This PAM module authenticates users based on the contents of a specified file. For example, if username exists in a file /etc/sshd/ssh.allow, sshd will grant login access.
What does the validateuser command in Pam do?
Debugging is often required to isolate the root cause of PAM authentication failures and to identify the configuration directive that is causing the authentication failure. The ValidateUser command generates entries in the InfoSphere Information Server installation log. indicating that the user name and password were successfully authenticated.
How is Pam used in SSH server security?
The text file contains a list of users that may not log in (or allowed to log in) using the SSH server. This is used for improving security. PAM (Pluggable authentication modules) allows you to define flexible mechanism for authenticating users. My previous post demonstrated how to deny or allow users using sshd configuration option.
Is it safe to use PAM for authentication?
Using it in anything but the most insecure test environment would not be recommended. From the pam_permit man page: pam_permit is a PAM module that always permit access. It does nothing else. So adding pam_permit.so as sufficient for authentication in this manner will completely bypass the security for all users.
Is the Pam _ Unix module declared in system-Auth Pam?
Assuming the lukas user is a local account, you should look at how the pam_unix.so module is declared in your system-auth pam file. But more information about the user account and pam configuration is necessary for a specific answer. While adding auth sufficient pam_permit.so is enough to gain access.