/etc/login.defs
# PASS_MAX_DAYS Maximum number of days a password may be used.
# PASS_MIN_DAYS Minimum number of days allowed between password changes.
# PASS_MIN_LEN Minimum acceptable password length.
# PASS_WARN_AGE Number of days warning given before a password expires.
/etc/pam.d/system-auth
#%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
auth required pam_env
.so
auth sufficient pam_unix
.so try_first_pass nullok
auth required pam_deny
.so
account required pam_unix
.so
password requisite pam_cracklib
.so try_first_pass retry=
3 type=
password sufficient pam_unix
.so try_first_pass use_authtok nullok sha512 shadow
password required pam_deny
.so
session optional pam_keyinit
.so revoke
session required pam_limits
.so
session [success=
1 default=ignore] pam_succeed_if
.so service
in crond quiet use_uid
session required pam_unix
.so
password requisite pam_cracklib
.so retry=
5 difok=
3 minlen=
10 ucredit=-
1 lcredit=-
3 dcredit=-
3 dictpath=/usr/share/cracklib/pw_dict
参数含义：
尝试次数：
5
最少不同字符：
3
最小密码长度：
10
最少大写字母：
1
最少小写字母：
3
最少数字：
3
密码字典：/usr/share/cracklib/pw_dict
参考: https://linux.cn/article-2518-1.html
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