Odd behavior from passwd. Post: 303039001

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Special Forums Cybersecurity Odd behavior from passwd. Post 303039001 by Peasant on Thursday 19th of September 2019 08:12:40 AM

09-19-2019

Moderator

I've seen this when multiple PAM rules are matched for one user or group.
Check pam configuration for such rules.

For instance :

Code:

.. other lines ..
password    [default=1 success=ignore] pam_succeed_if.so ... <some conditions like uid gid>
password    requisite     pam_cracklib.so ... <other pw related stuff>
password    [default=1 success=ignore] pam_succeed_if.so ... <other conditions for uid gid>
password    requisite     pam_cracklib.so ... <other pw related stuff>
... other lines...

If a user matches both conditions it will get password prompt twice.
So, AFAIK PAM rules should be very specific and be exclusive, so two rules do not match one group or user.

This is a bit older release, but in newer it is the same, except pam_pwquality.so is used.

Files which are used for such rules are :

Code:

/etc/pam.d/system-auth 
/etc/pam.d/password-auth

Hope that helps
Regards
Peasant.

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LEARN ABOUT SUSE

pam_rootok

PAM_ROOTOK(8)							 Linux-PAM Manual						     PAM_ROOTOK(8)

NAME

       pam_rootok - Gain only root access

SYNOPSIS

       pam_rootok.so [debug]

DESCRIPTION

       pam_rootok is a PAM module that authenticates the user if their UID is 0. Applications that are created setuid-root generally retain the
       UID of the user but run with the authority of an enhanced effective-UID. It is the real UID that is checked.

OPTIONS

       debug
	   Print debug information.

MODULE TYPES PROVIDED

       The auth, acct and password module types are provided.

RETURN VALUES

       PAM_SUCCESS
	   The UID is 0.

       PAM_AUTH_ERR
	   The UID is not 0.

EXAMPLES

       In the case of the su(1) application the historical usage is to permit the superuser to adopt the identity of a lesser user without the use
       of a password. To obtain this behavior with PAM the following pair of lines are needed for the corresponding entry in the /etc/pam.d/su
       configuration file:

	   # su authentication. Root is granted access by default.
	   auth  sufficient   pam_rootok.so
	   auth  required     pam_unix.so

SEE ALSO

       su(1), pam.conf(5), pam.d(5), pam(8)

AUTHOR

       pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>.

Linux-PAM Manual						    04/01/2010							     PAM_ROOTOK(8)