Red Hat Bugzilla – Bug 1007893
Add an option to pwquality to specify minimum number of character in each class.
Last modified: 2018-02-21 09:14:17 EST
Description of problem:
Currently pam_cracklib/pam_pwquality does not have an option to specify the "minimum number of character in each class". We can specify the number of characters required for each class (by using -weight) however this is not sufficient in some situations, for example:
Minimum length: 12
Minimum number of classes: 3
Minimum number of character in each class: 2
Cracklib/pwquality attempt is below:
password required pam_cracklib.so try_first_pass minclass=3 difok=4 retry=3 minlen=12 lcredit=-2 ucredit=-2 dcredit=-2 ocredit=-2
However, since -2 is specified for each class, pam is enforcing 4 classes. We cannot specify, the password only require 3 classes, but at least 2 characters for each class.
I do not think further complicating the possible options is a way to go. However if there is a real interest for this feature, feel free to submit a pull request with such implementation to the upstream on GitHub.