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  接下来,把id_dsa.pub发布到服务器上。通过FTP将公匙文件“/home/admin/.ssh/id_dsa.pub”,复制到远程服务器的“/home/admin/.ssh”目录。如果.ssh目录不存在,可以用mkdir命令先建立。然后,将“id_dsa.pub”重命名为“authorized_keys2”,代码如下:<br>
<br>
# mv id_dsa.pub authorized_keys2<br>
# chmod 644 authorized_keys2<br>
<br>
<br>
<br>
  注意,如果authorized_keys2文件的权限不正确,会导致SSH连接失败。<br>
<br>
  服务器收到请求之后,在该服务器的宿主目录下寻找公匙,然后检查该公匙是否合法。如果合法就用公匙加密一随机数(即所谓的challenge)并发送给客户端软件。客户端软件收到后就用私匙解密再把它发送给服务器。因为用公匙加密的数据只能用密匙解密,服务器经过比较就可以知道该客户连接的合法性。连接代码如下:<br>
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# ssl -l geminis www.test.com<br>
<br>
<br>
<br>
  系统返回以下信息:<br>
<br>
# Enter passphrase for key '/home/geminis/.ssh/id_dsa':   ******<br>
Last login: Wed Apr 16 12:31:49 2003 from www.geminis.com<br>
<br>
<br>
<br>
  OpenSSH客户端使用方法<br>
<br>
  1. Windows平台<br>
<br>
  客户端通常使用Windows平台,操作较为直观。下面对几种客户端工具进行介绍。<br>
<br>
  ◆ PuTTY<br>
<br>
  在客户端使用SSH较好的工具是PuTTY,这是一个开源软件。用户可以根据自己的配置情况对该软件进行修改,如图3所示。<br>
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 <br>
<br>
  图3 PuTTY配置界面<br>
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  如果是第一次使用该软件,系统会提示下载有关主机的“识别标记”,选择“yes”,下次登录就不会出现提示框。<br>
<br>
  ◆ Filezilla<br>
<br>
  Filezilla是客户端使用SFTP的一款不错的开源软件,对中文支持很好,配置界面如图4所示。<br>
<br>
 <br>
<br>
图4 Filezilla配置界面<br>
<br>
  2. Linux终端<br>
<br>
  在Linux终端下使用SSH,优点是操作更方便,无须其它软件;缺点是不太直观。使用方法及命令介绍如下:<br>
<br>
  ◆ SSH的使用<br>
<br>
# ssh -l geminis www.test.com<br>
Enter passphrase for key '/home/geminis/.ssh/id_dsa': <br>
//输入以前设置的标识符<br>
<br>
<br>
<br>
  ◆ SFTP的使用<br>
<br>
  # sftp  www.test.com<br>
<br>
<br>
<br>
  SFTP相关命令的使用方法如表1所示。<br>
<br>
  3.进阶提高要点<br>
<br>
  配置SSH客户端文件“/etc/ssh/ssh_config”,如图5所示。<br>
<br>
  图5 配置“/etc/ssh/ssh_config”文件<br>
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  表1 SFTP相关命令的使用方法<br>
<br>
  选项设置说明如表2所示。<br>
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  表2 SSH配置选项说明<br>
<br>
  配置SSH服务器端文件“/etc/ssh/sshd_config”,取消口令验证。把“PasswordAuthentication Yes”改为“no”,可以禁止使用第一种口令验证。<br>
<br>
  配置“/etc/ssh/sshd_config”文件,编辑“sshd_config”文件,加入或改变下面的参数:<br>
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# This is ssh server systemwide configuration file.  <br>
Port 22  <br>
ListenAddress 192.168.1.1  <br>
HostKey /etc/ssh/ssh_host_key  <br>
ServerKeyBits 1024  <br>
LoginGraceTime 600  <br>
KeyRegenerationInterval 3600  <br>
PermitRootLogin no  <br>
IgnoreRhosts yes  <br>
IgnoreUserKnownHosts yes  <br>
StrictModes yes  <br>
X11Forwarding no  <br>
PrintMotd yes  <br>
SyslogFacility AUTH  <br>
LogLevel INFO  <br>
RhostsAuthentication no  <br>
RhostsRSAAuthentication no  <br>
RSAAuthentication yes  <br>
PasswordAuthentication yes  <br>
PermitEmptyPasswords no  <br>
AllowUsers admin<br>
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<br>
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