/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.soauth sufficient pam_unix.so try_first_pass nullokauth required pam_deny.soaccount required pam_unix.sopassword requisite pam_cracklib.so try_first_pass retry=3 type=password sufficient pam_unix.so try_first_pass use_authtok nullok sha512 shadowpassword required pam_deny.sosession optional pam_keyinit.so revokesession required pam_limits.sosession [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uidsession required pam_unix.sopassword requisite pam_cracklib.so retry=5 difok=3 minlen=10 ucredit=-1 lcredit=-3 dcredit=-3 dictpath=/usr/share/cracklib/pw_dict參數含義：嘗試次數：5 最少不同字符：3 最小密碼長度：10 最少大寫字母：1 最少小寫字母：3 最少數字：3 密碼字典：/usr/share/cracklib/pw_dict
