CentOS openssh升级到openssh-7.2版本

安全部门漏洞检查，让升级openssh版本，升级操作不复杂，但毕竟是线上环境，主要注意如果你是通过ssh远程升级ssh版本，万一失败了，ssh不上去，是否可以到现场处理。（重要提示：当进行系统update的时候，会将sshd文件和ssh文件恢复到原来的版本，如果配置了支持jenkins相关的内容KexAlgorithms，会导致ssh无法启动，解决方式参考文章最后，使用不同目录安装方式）

环境：
cat /etc/issue

CentOS release 6.5 (Final)

ssh -V

OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013

openssl version -a

OpenSSL 1.0.1e-fips 11 Feb 2013

一、准备

备份ssh目录(重要)

cp -rf /etc/ssh /etc/ssh.bak

【 可以现场处理的，不用设置

安装telnet，避免ssh升级出现问题，导致无法远程管理

yum install telnet-server

vi /etc/xinetd.d/telnet

service telnet

{

flags = REUSE

socket_type = stream

wait = no

user = root

server = /usr/sbin/in.telnetd

log_on_failure += USERID

disable = no

}

默认不允许root登录

vi /etc/securetty

增加

pts/0

pts/1

pts/2

如果登录用户较多，需要更多的pts/*

/etc/init.d/xinetd restart

这样root可以telnet登录了

ssh升级后建议再修改回还原设置

】

二、安装

升级需要几个组件

yum install -y gcc openssl-devel pam-devel rpm-build

现在新版本，目前是openssh-7.3最新，但刚刚出来，为保险，我选用7.2版本

wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.3p1.tar.gz
wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.2p1.tar.gz
wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.1p1.tar.gz
解压升级包，并安装

tar -zxvf openssh-7.2p1.tar.gz

cd openssh-7.2p1

./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam --with-zlib --with-md5-passwords --with-tcp-wrappers

make && make install

安装后提示：

/etc/ssh/ssh_config already exists, install will not overwrite

/etc/ssh/sshd_config already exists, install will not overwrite

/etc/ssh/moduli already exists, install will not overwrite

ssh-keygen: generating new host keys: ECDSA ED25519

/usr/sbin/sshd -t -f /etc/ssh/sshd_config

/etc/ssh/sshd_config line 81: Unsupported option GSSAPIAuthentication

/etc/ssh/sshd_config line 83: Unsupported option GSSAPICleanupCredentials

修改配置文件,允许root登录

vi /etc/ssh/sshd_config

#PermitRootLogin yes

修改为

PermitRootLogin yes

命令：

sed -i '/^#PermitRootLogin/s/#PermitRootLogin yes/PermitRootLogin yes/' /etc/ssh/sshd_config

重启openSSH

service sshd restart

升级后版本

ssh -V

OpenSSH_7.2p1, OpenSSL 1.0.1e-fips 11 Feb 2013

【

如果之前你将原ssh目录修改名字

mv /etc/ssh /etc/ssh_bak

需要修改下配置：

修改配置文件,禁止root登录

sed -i '/^#PermitRootLogin/s/#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config

可以不操作，禁止dns解析

sed -i '/^#UseDNS yes/s/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config

可以不操作默认是22，修改ssh端口至6022

echo "Port 6022" >> /etc/ssh/sshd_config

】

注:在升级SSH时你的SSH是不会因为升级或重启服务而断掉的.

问题1：

[root@testserver2 tmp]# service sshd restart

Stopping sshd: [ OK ]

Starting sshd: /etc/ssh/sshd_config line 81: Unsupported option GSSAPIAuthentication

/etc/ssh/sshd_config line 83: Unsupported option GSSAPICleanupCredentials [ OK ]

解决：

将/etc/ssh/sshd_config文件中以上行数内容注释下即可

sed -i '/^GSSAPICleanupCredentials/s/GSSAPICleanupCredentials yes/#GSSAPICleanupCredentials yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication yes/#GSSAPIAuthentication yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication no/#GSSAPIAuthentication no/' /etc/ssh/sshd_config

问题2：

更新后ssh有如下提示，但不影响使用：

[root@testserver2 tmp]# ssh 10.111.32.51

/etc/ssh/ssh_config line 50: Unsupported option "gssapiauthentication"

解决：

可以注释/etc/ssh/ssh_config的gssapiauthentication内容

------------------------------------------------------------------------------------------

CentOS7升级openssh参考这里的内容

本次使用源码安装（系统需要gcc），各软件版本如下：

zlib-1.2.8

openssl-1.0.2h

openssh-7.3p1

安装步骤如下：

1、安装zlib

[root@CentOS7test ~]# cd zlib-1.2.8/

[root@CentOS7test zlib-1.2.8]# ./configure

[root@CentOS7test zlib-1.2.8]# make

[root@CentOS7test zlib-1.2.8]# make install

2、安装openssl

[root@CentOS7test ~]# cd openssl-1.0.2h/

[root@CentOS7test openssl-1.0.2h]# ./config --prefix=/usr/ --shared

[root@CentOS7test openssl-1.0.2h]# make

[root@CentOS7test openssl-1.0.2h]# make install

3、安装openssh

[root@CentOS7test ~]# cd openssh-7.3p1/

[root@CentOS7test openssh-7.3p1]# ./configure --prefix=/usr/local --sysconfdir=/etc/ssh --with-pam --with-zlib --with-md5-passwords --with-tcp-wrappers

[root@CentOS7test openssh-7.3p1]# make

[root@CentOS7test openssh-7.3p1]# make install

4、查看版本是否已更新

[root@CentOS7test openssh-7.3p1]# ssh -V

OpenSSH_7.3p1, OpenSSL 1.0.2h 3 May 2016

5、新介质替换原有内容

[root@CentOS7test openssh-7.3p1]# mv /usr/bin/ssh /usr/bin/ssh_bak

[root@CentOS7test openssh-7.3p1]# cp /usr/local/bin/ssh /usr/bin/ssh

[root@CentOS7test openssh-7.3p1]# mv /usr/sbin/sshd /usr/sbin/sshd_bak

[root@CentOS7test openssh-7.3p1]# cp /usr/local/sbin/sshd /usr/sbin/sshd

6-加载ssh配置重启ssh服务

[root@CentOS7test ~]# systemctl daemon-reload

[root@CentOS7test ~]# systemctl restart sshd.service

7、遇到的问题解决

问题1：

安装完成后，telnet 22端口不通，通过systemctl status sshd.service查看发现有警告信息

部分信息如Permissions 0640 for '/etc/ssh/ssh_host_ecdsa_key' are too open

修正：

修改相关提示文件的权限为600，并重启sshd服务（systemctl restart sshd.service）

查看服务状态（systemctl status sshd.service）

例：chmod 600 /etc/ssh/ssh_host_ecdsa_key

问题2：

安装完成后，如需root直接登录

修正：

修改/etc/ssh/sshd_config文件，将文件中#PermitRootLogin yes改为PermitRootLogin yes

并重启sshd服务

升级后验证

问题3：

如果你使用了jenkins进行部署，升级后会影响jenkins部署，测试连接web端会报错 Algorithm negotiation fail

修正：

在web端修改sshd_config文件最后一行增加以下内容

KexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1

参考：http://stackoverflow.com/questions/32627998/algorithm-negotiation-fail-in-jenkins

--------------------------------------------------------------

【临时修改版本号，运行很久的线上环境升级存在风险，如果可以的话只修改版本号吧（后期经过验证，这种修改版本号的方法无效，ssh -v IP可以查看版本）

查询

ssh -V

sshd -V

备份

cp /usr/bin/ssh /usr/bin/ssh.bak.version_edit

cp /usr/sbin/sshd /usr/sbin/sshd.bak.version_edit

修改

sed -i 's#OpenSSH_5.3p1#OpenSSH_7.2p1#g' /usr/bin/ssh

sed -i 's#OpenSSH_5.3p1#OpenSSH_7.2p1#g' /usr/sbin/sshd

】

补充汇总下：

centos7.X主机升级ssh

cp /usr/bin/ssh /usr/bin/ssh.bak.20161124

cp /usr/sbin/sshd /usr/bin/sshd.bak.20161124

mv /etc/ssh /etc/ssh.bak

---下载包、安装gcc 、编译等中间步骤参上边内容---

make && make install

/usr/sbin/sshd -t -f /etc/ssh/sshd_config

echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config

cp /etc/ssh.bak/sshd_config /etc/ssh/sshd_config 将原来的文件覆盖下这个新生成的内容

/bin/systemctl restart sshd.service

centos6.X升级ssh

cp /usr/bin/ssh /usr/bin/ssh.bak.20161124

cp /usr/sbin/sshd /usr/bin/sshd.bak.20161124

cp -rf /etc/ssh /etc/ssh.bak

---下载包、安装gcc 、编译等中间步骤参上边内容---

make && make install

sed -i '/^#PermitRootLogin/s/#PermitRootLogin yes/PermitRootLogin yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPICleanupCredentials/s/GSSAPICleanupCredentials yes/#GSSAPICleanupCredentials yes/' /etc/ssh/sshd_config

sed -i '/^UsePAM/s/UsePAM yes/#UsePAM yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication yes/#GSSAPIAuthentication yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication no/#GSSAPIAuthentication no/' /etc/ssh/sshd_config

service sshd restart

附录：

CentOS7 sshd_config配置内容

[python] view
plain copy

# $OpenBSD: sshd_config,v 1.93 2014/01/10 05:59:19 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:/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 override the

# default value.

# If you want to change the port on a SELinux system, you have to tell

# SELinux about this change.

# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER

#

#Port 22

#AddressFamily any

#ListenAddress 0.0.0.0

#ListenAddress ::

# The default requires explicit activation of protocol 1

#Protocol 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

HostKey /etc/ssh/ssh_host_ecdsa_key

HostKey /etc/ssh/ssh_host_ed25519_key

# Lifetime and size of ephemeral version 1 server key

#KeyRegenerationInterval 1h

#ServerKeyBits 1024

# Ciphers and keying

#RekeyLimit default none

# Logging

# obsoletes QuietMode and FascistLogging

#SyslogFacility AUTH

SyslogFacility AUTHPRIV

#LogLevel INFO

# Authentication:

#LoginGraceTime 2m

PermitRootLogin yes

#StrictModes yes

#MaxAuthTries 6

#MaxSessions 10

#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

#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

# Change to no to disable s/key passwords

#ChallengeResponseAuthentication yes

ChallengeResponseAuthentication no

# Kerberos options

#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

#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

UseDNS 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

# Example of overriding settings on a per-user basis

#Match User anoncvs

# X11Forwarding no

# AllowTcpForwarding no

# PermitTTY no

# ForceCommand cvs server

CentOS6 sshd_config配置内容

[python] view
plain copy

# $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 22

#AddressFamily any

#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 1

Protocol 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

#SyslogFacility AUTH

SyslogFacility AUTHPRIV

#LogLevel INFO

# Authentication:

#LoginGraceTime 2m

PermitRootLogin yes

#StrictModes yes

#MaxAuthTries 6

#MaxSessions 10

#RSAAuthentication yes

#PubkeyAuthentication yes

#AuthorizedKeysFile .ssh/authorized_keys

#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!

#PasswordAuthentication yes

#PermitEmptyPasswords no

PasswordAuthentication yes

# Change to no to disable s/key passwords

#ChallengeResponseAuthentication yes

ChallengeResponseAuthentication no

# Kerberos options

#KerberosAuthentication no

#KerberosOrLocalPasswd yes

#KerberosTicketCleanup yes

#KerberosGetAFSToken no

#KerberosUseKuserok yes

# GSSAPI options

#GSSAPICleanupCredentials yes

#GSSAPICleanupCredentials 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

# 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'.

#UsePAM no

UsePAM yes

# 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

#AllowAgentForwarding yes

#AllowTcpForwarding yes

#GatewayPorts no

#X11Forwarding no

X11Forwarding yes

#X11DisplayOffset 10

#X11UseLocalhost yes

#PrintMotd yes

#PrintLastLog yes

#TCPKeepAlive yes

#UseLogin no

UseLogin no

#UsePrivilegeSeparation yes

#PermitUserEnvironment no

#Compression delayed

#ClientAliveInterval 0

#ClientAliveCountMax 3

#ShowPatchLevel no

#PidFile /var/run/sshd.pid

#MaxStartups 10

#PermitTunnel no

#ChrootDirectory none

# no default banner path

#Banner none

# override default of no subsystems

Subsystem sftp /usr/libexec/openssh/sftp-server

# Example of overriding settings on a per-user basis

#Match User anoncvs

# X11Forwarding no

# AllowTcpForwarding no

# ForceCommand cvs server

UseDNS no

#GSSAPIAuthentication no

#GSSAPIAuthentication yes

20161205补充：

实际使用中发现ansible和jenkins使用时有些问题，网上查询了下，需要在/etc/ssh/sshd_config文件中最后增加两行：

[python] view
plain copy

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

KexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1

因为升级了openssh太新导致通信时加密算法出现问题，加上后重启就可以了。

20170428补充：

升级openssh版本脚本

[plain] view
plain copy

cp /usr/bin/ssh /usr/bin/ssh.bak.20161124

cp /usr/sbin/sshd /usr/bin/sshd.bak.20161124

cp -rf /etc/ssh /etc/ssh.bak

yum install -y gcc openssl-devel pam-devel rpm-build

wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.2p1.tar.gz
tar -zxvf openssh-7.2p1.tar.gz && cd openssh-7.2p1 && ./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam --with-zlib --with-md5-passwords --with-tcp-wrappers && make && make install

sed -i '/^#PermitRootLogin/s/#PermitRootLogin yes/PermitRootLogin yes/' /etc/ssh/sshd_config

sed -i 's/GSSAPIAuthentication yes/#GSSAPIAuthentication yes/' /etc/ssh/ssh_config

sed -i '/^GSSAPICleanupCredentials/s/GSSAPICleanupCredentials yes/#GSSAPICleanupCredentials yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication yes/#GSSAPIAuthentication yes/' /etc/ssh/sshd_config

sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication no/#GSSAPIAuthentication no/' /etc/ssh/sshd_config

#sed -i '/^#UsePAM/s/#UsePAM yes/UsePAM yes/' /etc/ssh/sshd_config 如果内网使用ldap需要设置这项

echo "

#ansible support" >>/etc/ssh/sshd_config

echo "Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,arcfour128,arcfour256,arcfour,blowfish-cbc,cast128-cbc" >>/etc/ssh/sshd_config

echo "

service sshd restart

重要提示：最近发现，在升级完ssh版本后，如果你进行了系统update或者升级用到ssh包的相关软件包，会导致ssh的版本回退到原来的版本。

20170504补充：

对于linux执行update，会导致升级后的ssh恢复到之前版本问题，处理方式（新版本ssh安装到不用的目录中，系统启动使用新目录的ssh）

一、备份文件

cp /usr/bin/ssh /usr/bin/ssh.bak.20171124

cp /usr/sbin/sshd /usr/bin/sshd.bak.20171124

cp -rf /etc/ssh /etc/ssh.bak.20171124

二、安装（/usr/local/ssh7为新目录，/usr/local/ssh7/ssh放置配置文件）

yum install -y gcc openssl-devel pam-devel rpm-build

wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.2p1.tar.gz
tar -zxvf openssh-7.2p1.tar.gz && cd openssh-7.2p1 && ./configure --prefix=/usr/local/ssh7 --sysconfdir=/usr/local/ssh7/ssh --with-pam --with-zlib --with-md5-passwords

--with-tcp-wrappers && make && make install

三、修改sshd_config内容

vi /usr/local/ssh7/ssh/sshd_config文件内容：

Port 22

Protocol 2

PermitRootLogin yes

AuthorizedKeysFile .ssh/authorized_keys

ChallengeResponseAuthentication no

UsePAM yes

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

X11Forwarding yes

Subsystem sftp /usr/local/ssh7/libexec/sftp-server

UseDNS no

#ansible支持加入

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

#jenkins支持加入

KexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-

sha256,diffie-hellman-group14-sha1

四、修改启动文件

cp /etc/init.d/sshd /etc/init.d/sshd7

mv /etc/init.d/sshd /etc/init.d/sshd.bak.20171124

vi /etc/init.d/sshd7

修改：

#SSHD=/usr/sbin/sshd 为

SSHD=/usr/local/ssh7/sbin/sshd

修改：

#[ -f /etc/ssh/sshd_config ] || exit 6 为

[ -f /usr/local/ssh7/ssh/sshd_config ] || exit 6

五、root下修改环境变量

# vi /etc/profile.d/ssh7.sh

export SSH_7=/usr/local/ssh7

export PATH=${SSH_7}/bin:${SSH_7}/sbin:$PATH

六、重启ssh

service sshd7 restart

以后需要这样重启ssh服务

参考：
http://blog.c1gstudio.com/archives/1474 https://www.douban.com/note/306958442/ http://www.cnblogs.com/elisun/p/5523696.html