sshd_config文件

  1 #       $OpenBSD: sshd_config,v 1.100 2016/08/15 12:32:04 naddy Exp $
  2 
  3 # This is the sshd server system-wide configuration file.  See
  4 # sshd_config(5) for more information.
  5 
  6 # This sshd was compiled with PATH=/usr/local/bin:/usr/bin
  7 
  8 # The strategy used for options in the default sshd_config shipped with
  9 # OpenSSH is to specify options with their default value where
 10 # possible, but leave them commented.  Uncommented options override the
 11 # default value.
 12 
 13 # If you want to change the port on a SELinux system, you have to tell
 14 # SELinux about this change.
 15 # semanage port -a -t ssh_port_t -p tcp #PORTNUMBER    <==在开启selinux的系统上，修改ssh端口的要修改selinux规则，用此命令修改
 16 #
 17 #Port 22           <==默认ssh端口，生产环境中建议改成五位数的端口 
 18 #AddressFamily any   <==地址家族，any表示同时监听ipv4和ipv6地址
 19 #ListenAddress 0.0.0.0  <==监听本机所有ipv4地址
 20 #ListenAddress ::    <==监听本机所有ipv6地址
 21 HostKey /etc/ssh/ssh_host_rsa_key   <==ssh所使用的RSA私钥路径
 22 #HostKey /etc/ssh/ssh_host_dsa_key
 23 HostKey /etc/ssh/ssh_host_ecdsa_key   <==ssh所使用的ECDSA私钥路径
 24 HostKey /etc/ssh/ssh_host_ed25519_key   <==ssh所使用的ED25519私钥路径
 25 
 26 # Ciphers and keying
 27 #RekeyLimit default none
 28 
 29 # Logging
 30 #SyslogFacility AUTH
 31 SyslogFacility AUTHPRIV    <==设定在记录来自sshd的消息的时候，是否给出“facility code”
 32 #LogLevel INFO    <==日志记录级别，默认为info 
 33 
 34 # Authentication:
 35 
 36 #LoginGraceTime 2m    <==限定用户认证时间为2min
 37 #PermitRootLogin yes   <==是否允许root账户ssh登录，生产环境中建议改成no，使用普通账户ssh登录
 38 #StrictModes yes    <==设置ssh在接收登录请求之前是否检查用户根目录和rhosts文件的权限和所有权，建议开启
 39 #MaxAuthTries 6   <==指定每个连接最大允许的认证次数。默认值是 6
 40 #MaxSessions 10   <==最大允许保持多少个连接。默认值是 10 
 41 
 42 #PubkeyAuthentication yes  <==是否开启公钥验证
 43 
 44 # The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
 45 # but this is overridden so installations will only check .ssh/authorized_keys
 46 AuthorizedKeysFile      .ssh/authorized_keys   <==公钥验证文件路径
 47 
 48 #AuthorizedPrincipalsFile none
 49 
 50 #AuthorizedKeysCommand none
 51 #AuthorizedKeysCommandUser nobody
 52 
 53 # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
 54 #HostbasedAuthentication no
 55 # Change to yes if you don't trust ~/.ssh/known_hosts for
 56 # HostbasedAuthentication   <==指定服务器在使用 ~/.shosts ~/.rhosts /etc/hosts.equiv 进行远程主机名匹配时，是否进行反向域名查询
 57 #IgnoreUserKnownHosts no  <==是否在 RhostsRSAAuthentication 或 HostbasedAuthentication 过程中忽略用户的 ~/.ssh/known_hosts 文件
 58 # Don't read the user's ~/.rhosts and ~/.shosts files
 59 #IgnoreRhosts yes   <==是否在 RhostsRSAAuthentication 或 HostbasedAuthentication 过程中忽略 .rhosts 和 .shosts 文件
 60 
 61 # To disable tunneled clear text passwords, change to no here!
 62 #PasswordAuthentication yes
 63 #PermitEmptyPasswords no    <==是否允许空密码
 64 PasswordAuthentication yes   <==是否允许密码验证，生产环境中建议改成no，只用密钥登录
 65 
 66 # Change to no to disable s/key passwords
 67 #ChallengeResponseAuthentication yes
 68 ChallengeResponseAuthentication no   <==是否允许质疑-应答(challenge-response)认证
 69 
 70 # Kerberos options
 71 #KerberosAuthentication no   <==是否使用Kerberos认证
 72 #KerberosOrLocalPasswd yes   <==如果 Kerberos 密码认证失败，那么该密码还将要通过其它的认证机制(比如 /etc/passwd)
 73 #KerberosTicketCleanup yes  <==是否在用户退出登录后自动销毁用户的 ticket
 74 #KerberosGetAFSToken no  <==如果使用了AFS并且该用户有一个 Kerberos 5 TGT，那么开启该指令后，将会在访问用户的家目录前尝试获取一个AFS token
 75 #KerberosUseKuserok yes
 76 
 77 # GSSAPI options
 78 GSSAPIAuthentication yes   <==是否允许基于GSSAPI的用户认证
 79 GSSAPICleanupCredentials no    <==是否在用户退出登录后自动销毁用户凭证缓存
 80 #GSSAPIStrictAcceptorCheck yes
 81 #GSSAPIKeyExchange no
 82 #GSSAPIEnablek5users no
 83 
 84 # Set this to 'yes' to enable PAM authentication, account processing,
 85 # and session processing. If this is enabled, PAM authentication will
 86 # be allowed through the ChallengeResponseAuthentication and
 87 # PasswordAuthentication.  Depending on your PAM configuration,
 88 # PAM authentication via ChallengeResponseAuthentication may bypass
 89 # the setting of "PermitRootLogin without-password".
 90 # If you just want the PAM account and session checks to run without
 91 # PAM authentication, then enable this but set PasswordAuthentication
 92 # and ChallengeResponseAuthentication to 'no'.
 93 # WARNING: 'UsePAM no' is not supported in Red Hat Enterprise Linux and may cause several
 94 # problems.
 95 UsePAM yes   <==是否通过PAM验证
 96 
 97 #AllowAgentForwarding yes
 98 #AllowTcpForwarding yes
 99 #GatewayPorts no     <==是否允许远程主机连接本地的转发端口
100 X11Forwarding yes    <==是否允许X11转发
101 #X11DisplayOffset 10  <==指定sshd（8）X11转发的第一个可用的显示区(display)数字。默认值是10
102 #X11UseLocalhost yes  <==是否应当将X11转发服务器绑定到本地loopback地址
103 #PermitTTY yes
104 #PrintMotd yes     <==指定sshd(8)是否在每一次交互式登录时打印 /etc/motd 文件的内容
105 #PrintLastLog yes  <==指定sshd(8)是否在每一次交互式登录时打印最后一位用户的登录时间
106 #TCPKeepAlive yes  <==指定系统是否向客户端发送 TCP keepalive 消息
107 #UseLogin no   <==是否在交互式会话的登录过程中使用 login（1）
108 #UsePrivilegeSeparation sandbox  <==是否让 sshd(8) 通过创建非特权子进程处理接入请求的方法来进行权限分离
109 #PermitUserEnvironment no  <==指定是否允许sshd(8)处理~/.ssh/environment以及 ~/.ssh/authorized_keys中的 environment= 选项
110 #Compression delayed  <==是否对通信数据进行加密，还是延迟到认证成功之后再对通信数据加密
111 #ClientAliveInterval 0  <==sshd(8)长时间没有收到客户端的任何数据，不发送"alive"消息
112 #ClientAliveCountMax 3   <==sshd(8)在未收到任何客户端回应前最多允许发送多个"alive"消息，默认值是 3 
113 #ShowPatchLevel no
114 #UseDNS no      <==是否使用dns反向解析
115 #PidFile /var/run/sshd.pid   <==指定存放SSH守护进程的进程号的路径
116 #MaxStartups 10:30:100   <==最大允许保持多少个未认证的连接
117 #PermitTunnel no   <==是否允许tun(4)设备转发
118 #ChrootDirectory none
119 #VersionAddendum none
120 
121 # no default banner path
122 #Banner none  <==将这个指令指定的文件中的内容在用户进行认证前显示给远程用户，默认什么内容也不显示，"none"表示禁用这个特性
123 
124 # Accept locale-related environment variables
125 AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
126 AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
127 AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
128 AcceptEnv XMODIFIERS
129 
130 # override default of no subsystems
131 Subsystem       sftp    /usr/libexec/openssh/sftp-server   <==配置一个外部子系统sftp及其路径
132 
133 # Example of overriding settings on a per-user basis
134 #Match User anoncvs    <==引入一个条件块。块的结尾标志是另一个 Match 指令或者文件结尾    
135 #       X11Forwarding no
136 #       AllowTcpForwarding no
137 #       PermitTTY no
138 #       ForceCommand cvs server

标签：文件,sshd,default,system,options,config,port
来源： https://www.cnblogs.com/shenzhiyuan/p/16551509.html