OpenSSH由5.3升级到7.3pl

Posted 2020-08-20

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第一步准备升级包

openssh相关包
openssh-7.3p1.tar.gz
openssl-1.0.2j.tar.gz
zlib-1.2.8.tar.gz
telnet相关包
telnet-0.17-47.el6_3.1.x86_64.rpm
telnet-server-0.17-47.el6_3.1.x86_64.rpm
xinetd-2.3.14-39.el6_4.x86_64.rpm
远程操作选择telnet;

第二步安装工具包

telnet安装

[[email protected] telnet]# rpm -ivh xinetd-2.3.14-39.el6_4.x86_64.rpm 
warning: xinetd-2.3.14-39.el6_4.x86_64.rpm: Header V3 RSA/SHA256 Signature, key I
D fd431d51: NOKEYPreparing...                ########################################### [100%]
   1:xinetd                 ########################################### [100%]
[[email protected] telnet]# rpm -ivh telnet-0.17-47.el6_3.1.x86_64.rpm 
warning: telnet-0.17-47.el6_3.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key I
D fd431d51: NOKEYPreparing...                ########################################### [100%]
   1:telnet                 ########################################### [100%]
[[email protected] telnet]# rpm -ivh telnet-server-0.17-47.el6_3.1.x86_64.rpm 
warning: telnet-server-0.17-47.el6_3.1.x86_64.rpm: Header V3 RSA/SHA256 Signature
, key ID fd431d51: NOKEYPreparing...                ########################################### [100%]
   1:telnet-server          ########################################### [100%]##设置telnet远程登录[[email protected] telnet]# vi /etc/xinetd.d/telnet# default: on# description: The telnet server serves telnet sessions; it uses \#   unencrypted username/password pairs for authentication.service telnet
{    flags       = REUSE    socket_type = stream            wait        = no    user        = root    server      = /usr/sbin/in.telnetd    log_on_failure  += USERID    disable     = no}
[[email protected] telnet]# service xinetd restart##添加telnet远程登录用户，(远程root不登录)[[email protected] telnet]# useradd test
[[email protected] telnet]# passwd test

第三步编译安装

删除已安装包

[[email protected] ssh]# rpm -qa|grep openssh
openssh-askpass-5.3p1-84.1.el6.x86_64
openssh-clients-5.3p1-84.1.el6.x86_64
openssh-5.3p1-84.1.el6.x86_64
openssh-server-5.3p1-84.1.el6.x86_64
[[email protected] ssh]# rpm -e openssh-askpass-5.3p1-84.1.el6.x86_64
[[email protected] ssh]# rpm -e openssh-clients-5.3p1-84.1.el6.x86_64 --nodeps
[[email protected] ssh]# rpm -e openssh-5.3p1-84.1.el6.x86_64 --nodeps
[[email protected] ssh]# rpm -e openssh-server-5.3p1-84.1.el6.x86_64

编译安装

[[email protected] ssh]# tar -zxvf zlib-1.2.8.tar.gz 
[[email protected] ssh]# cd zlib-1.2.8
[[email protected] zlib-1.2.8]# ./configure
[[email protected] zlib-1.2.8]# make && make install
[[email protected] zlib-1.2.8]# cd ..
[[email protected] ssh]# tar -zxvf openssl-1.0.2j.tar.gz 
[[email protected] ssh]# cd openssl-1.0.2j
[[email protected] openssl-1.0.2j]# ./config --prefix=/usr/ --shared
[[email protected] openssl-1.0.2j]# make
[[email protected] openssl-1.0.2j]# make test
[[email protected] openssl-1.0.2j]# make install
[[email protected] openssl-1.0.2j]# cd ..
[[email protected] ssh]# tar -zxvf openssh-7.3p1.tar.gz 
[[email protected] ssh]# cd openssh-7.3p1
[[email protected] openssh-7.3p1]# mv /etc/ssh /etc/ssh_bak
[[email protected] openssh-7.3p1]# ./configure --prefix=/usr --sysconfdir=/etc/ssh  --with-zlib   --with-md5-passwords
[[email protected] openssh-7.3p1]# make 
[[email protected] openssh-7.3p1]# make install
[[email protected] openssh-7.3p1]# cd contrib/redhat#复制启动脚本[[email protected] redhat]# cp sshd.init /etc/init.d/sshd
[[email protected] redhat]# cd /etc/init.d/
[[email protected] redhat]# chmod +x /etc/init.d/sshd 
[[email protected] init.d]# chkconfig sshd 
[[email protected] init.d]# chkconfig --add sshd
[[email protected] redhat]# cd ..#生成登录密钥[[email protected] openssh-7.3p1]# pwd
/mywork/soft/ssh/openssh-7.3p1
[[email protected] openssh-7.3p1]# ./ssh-keygen
[[email protected] openssh-7.3p1]# cd /root/.ssh/
[[email protected] .ssh]# ls
id_rsa  id_rsa.pub
[[email protected] .ssh]# cat id_rsa.pub  >> authorized_keys
[[email protected] .ssh]# service sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]
[[email protected] ~]# ssh -V
OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016

第四步所遇问题

安装完毕后root用户无法ssh登录
由于新版本的ssh禁用了root用户登录，需将允许登录开启

[[email protected] ssh]# pwd
/etc/ssh#设置允许root用户远程登录[[email protected] ssh]# cat /etc/ssh/sshd_config 
# Authentication:...#LoginGraceTime 2mPermitRootLogin yes

启动报错
报错效果如下：

[[email protected] ~]# service sshd restart   
Stopping sshd:                                             [  OK  ]
/sbin/restorecon:  lstat(/etc/ssh/ssh_host_key.pub) failed:  No such file or dire
ctoryStarting sshd:                                             [  OK  ]                                           [确定]

只要touch该文件即可规避

[[email protected] ~]# touch /etc/ssh/ssh_host_ecdsa_key.pub

再重启一下ssh服务，就没有那个报错了

[[email protected] .ssh]# service sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]

SecureCRT不能上传文件的解决办法

#将 /etc/ssh/sshd_config 中的Subsystem      sftp    /usr/libexec/openssh/sftp-server 
#改为Subsystem       sftp    internal-sftp#重启sshd后，sftp正常工作了

使用其他工具无法远程连接操作系统

解决方法：
=================================================================参考网上解决方法如下：
修改sshd的配置文件 /etc/ssh/sshd_config
在配置文件中添加：

Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,arcfour128,arcfour256,arcfour,blowfish-cbc,cast128-cbc

MACs hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,hmac-sha1-96,hmac-md5-96

KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,[email protected]

导致此问题的原因是ssh升级后，为了安全，默认不再采用原来一些加密算法，我们手工添加进去即可。

（添加三行或者添加最后一行，重启服务都报错如下）
但重启服务报错如下：
[[email protected] ~]# service sshd restart
Stopping sshd:[  OK  ]
Starting sshd:Unsupported KEX algorithm "ecdh-sha2-nistp521"
/etc/ssh/sshd_config line 137: Bad SSH2 KexAlgorithms ‘diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,[email protected]‘.
[FAILED]
[[email protected] ~]# 

=================================================================

修改为如下：
Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,arcfour128,arcfour256,arcfour,blowfish-cbc,cast128-cbc

MACs hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,hmac-sha1-96,hmac-md5-96

KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,diffie-hellman-group1-sha1,[email protected]    （此行中去掉ecdh-sha2-nistp521）