Linux开启SSL证书登陆方式（测试正常登陆）

以下是简单的操作步骤：

1）先添加一个维护账号：adduser msa
2）然后su - msa

cd /home/msa/

mkdir .ssh

cd .ssh
3）ssh-keygen -t rsa
指定密钥路径和输入口令之后，即在/home/msa/.ssh/中生成公钥和私钥：id_rsa id_rsa.pub。期间要设置秘钥密码：333444，证书登陆时要用到。

id_rsa 是客服端要用的证书

4）cat id_rsa.pub >> authorized_keys至于为什么要生成这个文件，因为sshd_config里面写的就是这个。然后chmod 400 authorized_keys，稍微保护一下。

5）用psftp把把id_rsa拉回本地，然后把服务器上的id_rsa和id_rsa.pub干掉

6）配置/etc/ssh/sshd_config

Protocol 2

#ServerKeyBits 1024

#PermitRootLogin no  #禁止root登录而已，与本文无关，加上安全些#以下三行没什么要改的，把默认的#注释去掉就行了

RSAAuthentication yes

PubkeyAuthentication yes

AuthorizedKeysFile    .ssh/authorized_keys

PasswordAuthentication no

#PermitEmptyPasswords no

7）重启 sshd      /sbin/service sshd restart

8）用 SecureCRTPortable 软件 publicKey方式登陆

9)配置文件：

#	$OpenBSD: sshd_config,v 1.80 2008/07/02 02:24:18 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/local/bin:/bin:/usr/bin# 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 change a# default value.#Port 22Port 220 #端口#ListenAddress 0.0.0.0#ListenAddress ::# Disable legacy (protocol version 1) support in the server for new# installations. In future the default will change to require explicit# activation of protocol 1Protocol 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# Lifetime and size of ephemeral version 1 server key#KeyRegenerationInterval 1h#ServerKeyBits 1024# Logging# obsoletes QuietMode and FascistLogging#LogLevel INFO# Authentication:#LoginGraceTime 2m#StrictModes yes#MaxAuthTries 6#MaxSessions 10RSAAuthentication yes	#-----------去掉注释------------------PubkeyAuthentication yes	#-----------去掉注释------------------AuthorizedKeysFile	.ssh/authorized_keys	#-----------去掉注释------------------#AuthorizedKeysCommand none#AuthorizedKeysCommandRunAs 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!#PermitEmptyPasswords no# Change to no to disable s/key passwords#ChallengeResponseAuthentication yesChallengeResponseAuthentication no# Kerberos options#KerberosAuthentication no#KerberosOrLocalPasswd yes#KerberosTicketCleanup yes#KerberosGetAFSToken no#KerberosUseKuserok yes# GSSAPI options#GSSAPIAuthentication noGSSAPIAuthentication yes#GSSAPICleanupCredentials yesGSSAPICleanupCredentials yes#GSSAPIStrictAcceptorCheck yes#GSSAPIKeyExchange 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# PAM authentication via ChallengeResponseAuthentication may bypass# If you just want the PAM account and session checks to run without# and ChallengeResponseAuthentication to 'no'.#UsePAM noUsePAM yes# Accept locale-related environment variablesAcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGESAcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENTAcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGEAcceptEnv XMODIFIERS#AllowAgentForwarding yes#AllowTcpForwarding yes#GatewayPorts no#X11Forwarding noX11Forwarding yes#X11DisplayOffset 10#X11UseLocalhost yes#PrintMotd yes#PrintLastLog yes#TCPKeepAlive yes#UseLogin no#UsePrivilegeSeparation yes#PermitUserEnvironment no#Compression delayed#ClientAliveInterval 0#ClientAliveCountMax 3#ShowPatchLevel no#PidFile /var/run/sshd.pid#MaxStartups 10:30:100#PermitTunnel no#ChrootDirectory none# no default banner path#Banner none# override default of no subsystemsSubsystem	sftp	/usr/libexec/openssh/sftp-server# Example of overriding settings on a per-user basis#Match User anoncvs#	X11Forwarding no#	AllowTcpForwarding no#	ForceCommand cvs serverUseDNS noAddressFamily inetPermitRootLogin yesSyslogFacility AUTHPRIV#PasswordAuthentication yesPasswordAuthentication no	#-----------禁止账号登陆------------------