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Full Discussion: Odd behavior from passwd.
Special Forums Cybersecurity Odd behavior from passwd. Post 303039001 by Peasant on Thursday 19th of September 2019 08:12:40 AM
Old 09-19-2019
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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vipw(8) 						      System Manager's Manual							   vipw(8)

NAME
vipw - Edits the /etc/passwd file SYNOPSIS
/usr/sbin/vipw DESCRIPTION
You use the vipw command to edit the /etc/passwd file with the editor defined in the EDITOR environment variable. If the variable is not set, the default editor is vi. The vipw command performs basic consistency checks on the edited file. If a hashed indexed passwd existed previously, the vipw command uses the mkpasswd command to create recreate it. The command must not be used on systems that use extended security attributes since it cannot set or change them. You must be root to run this command. Only root and security administrators should have execute access to this command. Since the vipw command cannot effectively change all the attributes of users, it should not be used in a secure environment. The vipw command accesses the following files, and requires the listed permissions: ------------------------------ Permissions File ------------------------------ rw /etc/passwd rw /etc/passwd.pag rw /etc/passwd.dir rw /etc/ptmp rw /etc/ptmp.pag rw /etc/ptmp.dir ------------------------------ EXAMPLE
To edit the /etc/passwd file, type the following command and add the required line entry: vipw FILES
Specifies the command path RELATED INFORMATION
Commands: passwd(1), passwd(4), adduser(8), mkpasswd(8) delim off vipw(8)
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