ESX升级至7.0.3后Go SSH出现host key mismatch问题求助

环境 #

我们使用Go语言的SSH库（基于私钥）远程执行ESX上的命令。

错误信息 #

使用golang.org/x/crypto/ssh库连接ESX时失败，报错：

ssh: handshake failed: ssh: host key mismatch

变更背景 #

将ESX版本升级至7.0.3后，其内置的OpenSSH升级到8.8版本，该版本默认禁用了基于SHA-1算法的RSA签名。

兼容性问题 #

我们使用的旧版Go SSH库默认仅支持SHA-1算法，存在兼容性问题。

已尝试的解决方案 #

• 升级Go语言版本以支持SHA-2系列算法；
• 按照OpenSSH和Broadcom的建议，在ESX的SSH配置中添加以下参数，但未生效：

  HostkeyAlgorithms +ssh-rsa
  PubkeyAcceptedAlgorithms +ssh-rsa

验证可行的操作 #

• 确认客户端.ssh/known_hosts与服务器authorized_keys中的密钥一致；
• 通过ssh-keygen -y -e -f .ssh/id_rsa从私钥生成公钥，与authorized_keys完全匹配；
• 使用id_rsa手动SSH连接正常；
• 将密钥类型从ssh-rsa改为ecdsa-sha2-nistp521后，Go客户端连接正常

客户端SSH配置 #

hostkeyalgorithms ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
hostbasedkeytypes ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256,ssh-rsa
kexalgorithms diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256
casignaturealgorithms ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256,ssh-rsa

服务器SSH配置 #

ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
hostkeyalgorithms ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
hostbasedalgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256,ssh-rsa
kexalgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256

服务器SSH日志（/var/log/auth.log） #

2024-05-13T04:51:46.823Z sshd[2220706]: FIPS mode initialized
2024-05-13T04:51:46.304Z sshd[2220684]: Connection from <客户端IP> port 41440
2024-05-13T04:51:46.313Z sshd[2220684]: Connection closed by <客户端IP> port 41440 [preauth]

内容的提问来源于stack exchange，提问作者Dipak