openssh9.9 是2024.9.20出的最新版ssh。因为客户扫描出一大堆centos7的漏洞，全是这个openssh的，好多补丁，所以索性升级到最新版。

需要自己制作rpm包，这个我是不懂，照这个来：

Linux服务器升级openssh9.9最新版全过程，及遇到问题处理_openssh-server最新版本-CSDN博客

作者没有说明怎么处理异常，我这里是centos7的rpm：

https://download.csdn.net/download/leinchu/89896129

使用方法：

mkdir openssh9
mv openssh9.9.tar.gz openssh9
cd openssh9
tar xfz openssh9.9.tar.gz

rpm -ivh  --nodeps --force openssh-9.9p1-1.el7.x86_64.rpm
rpm -ivh  --nodeps --force openssh9.9.tar.gz
rpm -ivh  --nodeps --force openssh-clients-9.9p1-1.el7.x86_64.rpm
rpm -ivh  --nodeps --force openssh-debuginfo-9.9p1-1.el7.x86_64.rpm
rpm -ivh  --nodeps --force openssh-server-9.9p1-1.el7.x86_64.rpm

ssh-keygen -A

chmod 600 /etc/ssh/ssh_host_ed25519_key
chown root:root /etc/ssh/ssh_host_ed25519_key

sudo chmod 600  /etc/ssh/ssh_host_rsa_key
chown root:root /etc/ssh/ssh_host_rsa_key

sudo chmod 600  /etc/ssh/ssh_host_ecdsa_key
chown root:root /etc/ssh/ssh_host_ecdsa_key

sshd -t -f /etc/ssh/sshd_config
 mv /etc/pam.d/sshd  /etc/pam.d/sshdbak
vi /etc/pam.d/sshd
#%PAM-1.0
auth       required     pam_sepermit.so
auth       include      password-auth
account    required     pam_nologin.so
account    include      password-auth
password   include      password-auth
# pam_selinux.so close should be the first session rule
session    required     pam_selinux.so close
session    required     pam_loginuid.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session    required     pam_selinux.so open env_params
session    optional     pam_keyinit.so force revoke
session    include      password-auth

systemctl restart sshd

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

验证：ssh -V

遇到的报错：

Unable to load host key "/etc/ssh/ssh_host_ed25519_key": bad permissions
sshd: no hostkeys available -- exiting

Oct 17 11:57:33 snmp sshd[139477]: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Oct 17 11:57:33 snmp sshd[139477]: @         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
Oct 17 11:57:33 snmp sshd[139477]: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Oct 17 11:57:33 snmp sshd[139477]: Permissions 0640 for '/etc/ssh/ssh_host_rsa_key' are too open.
Oct 17 11:57:33 snmp sshd[139477]: It is required that your private key files are NOT accessible by others.
Oct 17 11:57:33 snmp sshd[139477]: This private key will be ignored.
Oct 17 11:57:33 snmp sshd[139477]: Unable to load host key "/etc/ssh/ssh_host_rsa_key": bad permissions
Oct 17 11:57:33 snmp systemd[1]: sshd.service: main process exited, code=exited, status=1/FAILURE
Oct 17 11:57:33 snmp sshd[139477]: Unable to load host key: /etc/ssh/ssh_host_rsa_key
Oct 17 11:57:33 snmp sshd[139477]: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Oct 17 11:57:33 snmp sshd[139477]: @         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
Oct 17 11:57:33 snmp sshd[139477]: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Oct 17 11:57:33 snmp sshd[139477]: Permissions 0640 for '/etc/ssh/ssh_host_ecdsa_key' are too open.
Oct 17 11:57:33 snmp sshd[139477]: It is required that your private key files are NOT accessible by others.
Oct 17 11:57:33 snmp sshd[139477]: This private key will be ignored.
Oct 17 11:57:33 snmp sshd[139477]: Unable to load host key "/etc/ssh/ssh_host_ecdsa_key": bad permissions
Oct 17 11:57:33 snmp sshd[139477]: Unable to load host key: /etc/ssh/ssh_host_ecdsa_key
Oct 17 11:57:33 snmp sshd[139477]: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Oct 17 11:57:33 snmp sshd[139477]: @         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
Oct 17 11:57:33 snmp sshd[139477]: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Oct 17 11:57:33 snmp sshd[139477]: Permissions 0640 for '/etc/ssh/ssh_host_ed25519_key' are too open.
Oct 17 11:57:33 snmp sshd[139477]: It is required that your private key files are NOT accessible by others.
Oct 17 11:57:33 snmp sshd[139477]: This private key will be ignored.
Oct 17 11:57:33 snmp sshd[139477]: Unable to load host key "/etc/ssh/ssh_host_ed25519_key": bad permissions
Oct 17 11:57:33 snmp sshd[139477]: Unable to load host key: /etc/ssh/ssh_host_ed25519_key
Oct 17 11:57:33 snmp sshd[139477]: sshd: no hostkeys available -- exiting.
Oct 17 11:57:33 snmp systemd[1]: Failed to start OpenSSH server daemon.
-- Subject: Unit sshd.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit sshd.service has failed.
-- 
-- The result is failed.
Oct 17 11:57:33 snmp systemd[1]: Unit sshd.service entered failed state.
Oct 17 11:57:33 snmp systemd[1]: sshd.service failed.
Oct 17 11:57:33 snmp polkitd[7888]: Unregistered Authentication Agent for unix-process:139470:389161800 (system bus name :1.41641, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
Oct 17 11:58:01 snmp systemd[1]: Created slice User Slice of pcp.
-- Subject: Unit user-994.slice has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit user-994.slice has finished starting up.
-- 
-- The start-up result is done.
Oct 17 11:58:01 snmp systemd[1]: Started Session 13127 of user pcp.
-- Subject: Unit session-13127.scope has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit session-13127.scope has finished starting up.
-- 
-- The start-up result is done.
Oct 17 11:58:01 snmp CROND[139602]: (pcp) CMD ( /usr/libexec/pcp/bin/pmie_check -C)
Oct 17 11:58:01 snmp systemd[1]: Removed slice User Slice of pcp.
-- Subject: Unit user-994.slice has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit user-994.slice has finished shutting down.