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I am using CentOS and I want to set the minimum password length, minimum password expiry , maximum password expiry and password complexity in my system.

I have looked over some tutorials to change the system-auth file, but it didnt work.

Hoping to get some answers here.

Thanks in advance :D

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  • 3
    Which tutorials? What happened when you tried them? Commented Jun 26, 2014 at 7:35
  • Added few lines in the system-auth file but nothinghappens. Commented Jun 26, 2014 at 8:15
  • It still accepts any password you give them when i do "passwd" Commented Jun 26, 2014 at 8:15
  • What lines did you add? What tests did you do to check that “nothinghappens”? Commented Jun 27, 2014 at 22:00

1 Answer 1

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Some of those are set by the system administrator with the passwd command.

-n This will set the minimum password lifetime, in days, if the user's account supports password lifetimes. Available to root only.

-x This will set the maximum password lifetime, in days, ...

Other are managed through the PAM module cracklib. The pam_cracklib man page should document what features are supported on your system. You can set those in either /etc/pam.d/system-auth global configuration file and/or the passwd specific file /etc/pam.d/passwd e.g.

# /etc/pam.d/passwd
... 
password  required pam_cracklib.so difok=3 minlen=15 dcredit= 2 ocredit=2
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  • I tried doing that in the system-auth file still no changes were observed when i actually changed the password Commented Jun 26, 2014 at 8:55
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    Could you amend your question with the contents of the relevant pam.d configuration files? Commented Jun 26, 2014 at 8:57

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