我最近有一些我认为与 pam 有关的问题，但由于某种原因，登录尝试之间仍然没有延迟。
环顾四周，人们似乎只遇到相反的问题：延迟太长。
我认为这个延迟被硬编码到 pam 中，这导致我进入 sshd_config，但那里也没有任何内容。
任何有关在哪里查看的提示都值得赞赏 - 除了 pam 和 sshd 之外，此过程还涉及什么？这可能是安全漏洞的迹象（一如既往，有很多奇怪的 IP 来敲我的门），我应该重新安装系统吗？
延迟存在于其他地方，只有当 ssh'ing 消失时才会出现延迟。
/etc/ssh/sshd_config:
# $OpenBSD: sshd_config,v 1.95 2015/04/27 21:42:48 djm Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
# The default requires explicit activation of protocol 1
#Protocol 2
# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024
# Ciphers and keying
#RekeyLimit default none
# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
PermitRootLogin no
#StrictModes yes
#MaxAuthTries 3
#MaxSessions 2
#RSAAuthentication yes
#PubkeyAuthentication yes
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to no to disable s/key passwords
ChallengeResponseAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no # pam does that
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
UsePrivilegeSeparation sandbox # Default for new installations.
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# override default of no subsystems
Subsystem sftp /usr/lib/ssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# PermitTTY no
# ForceCommand cvs server
cat /etc/pam.d/*:
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
account required pam_permit.so
password include system-auth
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_unix.so sha512 shadow
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
account required pam_permit.so
password include system-auth
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth required pam_securetty.so
auth requisite pam_nologin.so
auth include system-local-login
account include system-local-login
session include system-local-login
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_unix.so sha512 shadow
#%PAM-1.0
auth required pam_unix.so
account required pam_unix.so
password required pam_unix.so
session required pam_unix.so
#%PAM-1.0
#password required pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 retry=3
#password required pam_unix.so sha512 shadow use_authtok
password required pam_unix.so sha512 shadow nullok
#%PAM-1.0
# For root login to succeed here with pam_securetty, "rlogin" must be
# listed in /etc/securetty.
auth required pam_nologin.so
auth required pam_securetty.so
auth required pam_env.so
auth sufficient pam_rhosts.so
auth include system-auth
account include system-auth
password include system-auth
session optional pam_keyinit.so force revoke
session required pam_loginuid.so
session include system-auth
#%PAM-1.0
# For root login to succeed here with pam_securetty, "rsh" must be
# listed in /etc/securetty.
auth required pam_nologin.so
auth required pam_securetty.so
auth required pam_env.so
auth required pam_rhosts.so
account include system-auth
session optional pam_keyinit.so force revoke
session required pam_loginuid.so
session include system-auth
auth required pam_unix.so
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
#auth required pam_securetty.so #disable remote root
auth include system-remote-login
account include system-remote-login
password include system-remote-login
session include system-remote-login
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth sufficient pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth required pam_wheel.so use_uid
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth sufficient pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth required pam_wheel.so use_uid
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
#%PAM-1.0
auth include system-auth
account include system-auth
session include system-auth
#%PAM-1.0
auth required pam_unix.so try_first_pass nullok
auth optional pam_permit.so
auth required pam_env.so
account required pam_unix.so
account optional pam_permit.so
account required pam_time.so
password required pam_unix.so try_first_pass nullok sha512 shadow
password optional pam_permit.so
session required pam_limits.so
session required pam_unix.so
session optional pam_permit.so
#%PAM-1.0
auth include system-login
account include system-login
password include system-login
session include system-login
#%PAM-1.0
auth required pam_tally.so onerr=succeed file=/var/log/faillog
auth required pam_shells.so
auth requisite pam_nologin.so
auth include system-auth
account required pam_access.so
account required pam_nologin.so
account include system-auth
password include system-auth
session optional pam_loginuid.so
session include system-auth
session optional pam_motd.so motd=/etc/motd
session optional pam_mail.so dir=/var/spool/mail standard quiet
-session optional pam_systemd.so
session required pam_env.so
#%PAM-1.0
auth include system-login
account include system-login
password include system-login
session include system-login
#%PAM-1.0
auth sufficient pam_permit.so
account include system-auth
session optional pam_loginuid.so
session required pam_limits.so
session required pam_unix.so
session optional pam_permit.so
session required pam_env.so
# This file is part of systemd.
#
# Used by systemd --user instances.
account include system-login
session include system-login
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
#%PAM-1.0
auth sufficient pam_rootok.so
auth required pam_unix.so
account required pam_unix.so
session required pam_unix.so
password required pam_permit.so
一如既往，如果您需要更多信息，请告诉我。