第一：打开telnet
1：首先linux版本
cat /etc/redhat-release
2：查看是否安装过ssl和ssh
rpm -qa|grep ssh
rpm -qa|grep ssl
3：查看当前版本
ssh -V
4：查看是否安装telnet
rpm -qa|grep telnet
5：安装telnet
rpm -ivh telnet xinetd --nodeps
6：启动服务
systemctl start xinetd.service
systemctl enable xinetd.service
7：设置telent允许root登录
vim /etc/xinetd.d/telnet
# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}
disable = no 是允许root远程登陆
disable = yes 是不允许root远程登陆
第二：安装ssl3.2
1：安装依赖
yum install -y gcc* perl* zlib*
2：解压
tar -zxvf openssl-3.2.0-alpha2.tar.gz
3：进入目录
cd openssl-3.2.0-alpha2
4：编译
./config enable-fips --prefix=/usr/local --openssldir=/usr/local/openssl
make -j 2
mv /usr/bin/openssl /usr/bin/openssl.bak
make install
5：设置软连接
ln -sf /usr/local/bin/openssl /usr/bin/openssl
ln -sf /usr/local/include/openssl /usr/include/openssl
6：更新动态链接库
whereis openssl
[root@alibaba openssl-3.2.0-alpha2]# ldd /usr/local/bin/openssl
linux-vdso.so.1 => (0x00007ffec4ebe000)
libssl.so.3 => not found
libcrypto.so.3 => not found
libdl.so.2 => /lib64/libdl.so.2 (0x00007f543395e000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5433742000)
libc.so.6 => /lib64/libc.so.6 (0x00007f5433375000)
/lib64/ld-linux-x86-64.so.2 (0x00007f5433b62000)
[root@alibaba openssl-3.2.0-alpha2]#
发现缺少libssl.so.3
查找这个libssl.so.3
[root@alibaba openssl-3.2.0-alpha2]# find / -name libssl.so.3
/root/openssl-3.2.0-alpha2/libssl.so.3
/usr/local/lib64/libssl.so.3
[root@alibaba openssl-3.2.0-alpha2]
设置软连接
ln -sf /usr/local/lib64/libcrypto.so.3 /usr/lib64/libcrypto.so.3
刷新库
ldconfig -v
再次查看ldd，发现已经链接上去了
[root@alibaba openssl-3.2.0-alpha2]# ldd /usr/local/bin/openssl
linux-vdso.so.1 => (0x00007fff9c1bf000)
libssl.so.3 => /lib64/libssl.so.3 (0x00007ff9eb9b8000)
libcrypto.so.3 => /lib64/libcrypto.so.3 (0x00007ff9eb309000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007ff9eb105000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff9eaee9000)
libc.so.6 => /lib64/libc.so.6 (0x00007ff9eab1c000)
/lib64/ld-linux-x86-64.so.2 (0x00007ff9ebca5000)
[root@alibaba openssl-3.2.0-alpha2]#
查看版本
[root@alibaba openssl-3.2.0-alpha2]# openssl version
OpenSSL 3.2.0-alpha2 28 Sep 2023 (Library: OpenSSL 3.2.0-alpha2 28 Sep 2023)
[root@alibaba openssl-3.2.0-alpha2]#
第三：安装openssh9.5
1：解压
tar -zxvf openssh-9.5p1.tar.gz
2：进入目录
cd openssh-9.5p1/
3：备份pam.d
mv /etc/pam.d/sshd /etc/pam.d/sshd.bak
4：编译
./configure --prefix=/usr \
--sysconfdir=/etc/ssh \
--with-pam \
--with-zlib \
--with-ssl-dir=/usr/local/openssl \
--with-md5-passwords \
--mandir=/usr/share/man \
--without-openssl-header-check
make -j 2
卸载openssh旧版本
rpm -e `rpm -qa | grep openssh` --nodeps
make install
5：拷贝启动服务
cp contrib/redhat/sshd.init /etc/init.d/sshd
cp contrib/redhat/sshd.pam /etc/pam.d/sshd
6：查看升级后版本
[root@alibaba openssh-9.5p1]# ssh -V
OpenSSH_9.5p1, OpenSSL 3.2.0-alpha2 28 Sep 2023
[root@alibaba openssh-9.5p1]#
7：允许root远程登陆
sed -i 's/^\#PermitRootLogin prohibit-password/PermitRootLogin yes/g' /etc/ssh/sshd_config
8：授予权限
cd /etc/ssh/
chmod 400 ssh_host_ecdsa_key ssh_host_ed25519_key ssh_host_rsa_key
9：还原sshd
[root@alibaba pam.d]# mv /etc/pam.d/sshd.bak /etc/pam.d/sshd
mv: overwrite ‘/etc/pam.d/sshd’? y
[root@alibaba pam.d]#
10：启动服务
redhat7重启命令
systemctl enable sshd
systemctl restart sshd
systemctl status sshd
redhat6重启命令
chkconfig sshd on
service sshd restart
service sshd status