sshd_config配置文件

[root@u0704-t5-test-shaoew1 ~]$cat /etc/ssh/sshd_config

    #Port 22                                          监听端口，默认监听22端口   【默认可修改】
    #AddressFamily any                        IPV4和IPV6协议家族用哪个，any表示二者均有
    #ListenAddress 0.0.0.0                   指明监控的地址，0.0.0.0表示本机的所有地址  【默认可修改】
    #ListenAddress ::                            指明监听的IPV6的所有地址格式
    # The default requires explicit activation of protocol 1   
    #Protocol 2                                      使用SSH第二版本，centos7默认第一版本已拒绝
    # HostKey for protocol version 1      一版的SSH支持以下一种秘钥形式
    #HostKey /etc/ssh/ssh_host_key
    # HostKeys for protocol version 2                  使用第二版本发送秘钥，支持以下四种秘钥认证的存放位置：（centos6只支持rsa和dsa两种）
    HostKey /etc/ssh/ssh_host_rsa_key               rsa私钥认证 【默认】
    #HostKey /etc/ssh/ssh_host_dsa_key            dsa私钥认证
    HostKey /etc/ssh/ssh_host_ecdsa_key          ecdsa私钥认证
    HostKey /etc/ssh/ssh_host_ed25519_key      ed25519私钥认证
    # Lifetime and size of ephemeral version 1 server key
    #KeyRegenerationInterval 1h
    #ServerKeyBits 1024        主机秘钥长度        
    # Ciphers and keying      
    #RekeyLimit default none
    # Logging
    # obsoletes QuietMode and FascistLogging
    #SyslogFacility AUTH
    SyslogFacility AUTHPRIV                   当有人使用ssh登录系统的时候，SSH会记录信息，信息保存在/var/log/secure里面
    #LogLevel INFO                                  日志的等级
    # Authentication:
    #LoginGraceTime 2m                           登录的宽限时间，默认2分钟没有输入密码，则自动断开连接
    #PermitRootLogin no
    PermitRootLogin yes                            是否允许管理员直接登录，'yes'表示允许
    #StrictModes yes                                 是否让sshd去检查用户主目录或相关文件的权限数据
    #MaxAuthTries 6                                  最大认证尝试次数，最多可以尝试6次输入密码。之后需要等待某段时间后才能再次输入密码
    #MaxSessions 10                                 允许的最大会话数
    #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                 服务器生成一对公私钥之后，会将公钥放到.ssh/authorizd_keys里面，将私钥发给客户端
    #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
    PasswordAuthentication yes                    是否允许支持基于口令的认证
    # Change to no to disable s/key passwords
    #ChallengeResponseAuthentication yes
    ChallengeResponseAuthentication no     是否允许任何的密码认证
    # Kerberos options                                   是否支持kerberos（基于第三方的认证，如LDAP）认证的方式，默认为no 
    #KerberosAuthentication no
    #KerberosOrLocalPasswd yes
    #KerberosTicketCleanup yes
    #KerberosGetAFSToken no
    #KerberosUseKuserok yes
    # GSSAPI options                                       
    GSSAPIAuthentication yes
    GSSAPICleanupCredentials no
    #GSSAPIStrictAcceptorCheck yes
    #GSSAPIKeyExchange no
    #GSSAPIEnablek5users no
    # 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'.
    # WARNING: 'UsePAM no' is not supported in Red Hat Enterprise Linux and may cause several
    # problems.
    UsePAM yes
    #AllowAgentForwarding yes
    #AllowTcpForwarding yes
    #GatewayPorts no
    X11Forwarding yes                    是否允许x11转发，可以让窗口的数据通过SSH连接来传递(请查看ssh -X 参数)：#ssh -X  user@IP
    #X11DisplayOffset 10
    #X11UseLocalhost yes 
    #PermitTTY yes
    #PrintMotd yes
    #PrintLastLog yes
    #TCPKeepAlive yes
    #UseLogin no
    UsePrivilegeSeparation sandbox # Default for new installations.
    #PermitUserEnvironment no
    #Compression delayed
    #ClientAliveInterval 0
    #ClientAliveCountMax 3
    #ShowPatchLevel no
    #UseDNS yes              是否反解DNS，如果想让客户端连接服务器端快一些，这个可以改为no
    #PidFile /var/run/sshd.pid
    #MaxStartups 10:30:100
    #PermitTunnel no
    #ChrootDirectory none
    #VersionAddendum none
    # no default banner path
    #Banner none
    # Accept locale-related environment variables
    AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
    AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
    AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
    AcceptEnv XMODIFIERS
    # override default of no subsystems
    Subsystem sftp /usr/libexec/openssh/sftp-server                    支持 SFTP ，如果注释掉，则不支持sftp连接
    # Example of overriding settings on a per-user basis
    #Match User anoncvs
    # X11Forwarding no
    # AllowTcpForwarding no
    # PermitTTY no
    # ForceCommand cvs server
    AllowUsers user1 user2                登录白名单（默认没有这个配置，需要自己手动添加），允许远程登录的用户。如果名单中没有的用户，则提示拒绝登录