09-07-2010
Hi,
You found information in files /usr/share/doc/pam*
maybe ??minlen??
you must edit a file in /etc/pam.d
This User Gave Thanks to john1212 For This Post:
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LEARN ABOUT CENTOS
pwquality.conf
PWQUALITY.CONF(5) File Formats Manual PWQUALITY.CONF(5)
NAME
pwquality.conf - configuration for the libpwquality library
SYNOPSIS
/etc/security/pwquality.conf
DESCRIPTION
pwquality.conf provides a way to configure the default password quality requirements for the system passwords. This file is read by the
libpwquality library and utilities that use this library for checking and generating passwords.
The file has a very simple name = value format with possible comments starting with # character. The whitespace at the beginning of line,
end of line, and around the = sign is ignored.
OPTIONS
The possible options in the file are:
difok
Number of characters in the new password that must not be present in the old password. (default 5)
minlen
Minimum acceptable size for the new password (plus one if credits are not disabled which is the default). (See pam_pwquality(8).)
Cannot be set to lower value than 6. (default 9)
dcredit
The maximum credit for having digits in the new password. If less than 0 it is the minimum number of digits in the new password.
(default 1)
ucredit
The maximum credit for having uppercase characters in the new password. If less than 0 it is the minimum number of uppercase char-
acters in the new password. (default 1)
lcredit
The maximum credit for having lowercase characters in the new password. If less than 0 it is the minimum number of lowercase char-
acters in the new password. (default 1)
ocredit
The maximum credit for having other characters in the new password. If less than 0 it is the minimum number of other characters in
the new password. (default 1)
minclass
The minimum number of required classes of characters for the new password (digits, uppercase, lowercase, others). (default 0)
maxrepeat
The maximum number of allowed same consecutive characters in the new password. The check is disabled if the value is 0. (default
0)
maxsequence
The maximum length of monotonic character sequences in the new password. Examples of such sequence are '12345' or 'fedcb'. Note
that most such passwords will not pass the simplicity check unless the sequence is only a minor part of the password. The check is
disabled if the value is 0. (default 0)
maxclassrepeat
The maximum number of allowed consecutive characters of the same class in the new password. The check is disabled if the value is
0. (default 0)
gecoscheck
If nonzero, check whether the words longer than 3 characters from the GECOS field of the user's passwd entry are contained in the
new password. The check is disabled if the value is 0. (default 0)
badwords
Space separated list of words that must not be contained in the password. These are additional words to the cracklib dictionary
check. This setting can be also used by applications to emulate the gecos check for user accounts that are not created yet.
dictpath
Path to the cracklib dictionaries. Default is to use the cracklib default.
SEE ALSO
pwscore(1), pwmake(1), pam_pwquality(8)
AUTHORS
Tomas Mraz <tmraz@redhat.com>
Red Hat, Inc. 10 Nov 2011 PWQUALITY.CONF(5)