golang ssh handshake failed: ssh: host key mismatch

╰+攻爆jí腚メ 2022-02-26 11:20 311阅读 0赞

解决办法，如下所示，在ssh的配置里加上HostKeyCallback，

config := &ssh.ClientConfig{ 
    		User: user,
    		Auth: []ssh.AuthMethod{ 
    			ssh.Password(pass),
    		},
    		// allow any host key to be used (non-prod)
    		// HostKeyCallback: ssh.InsecureIgnoreHostKey(),
    
    		// verify host public key
    		HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error { 
                    return nil
            }, //ssh.FixedHostKey(hostKey),
    		// optional host key algo list
    		HostKeyAlgorithms: []string{ 
    			ssh.KeyAlgoRSA,
    			ssh.KeyAlgoDSA,
    			ssh.KeyAlgoECDSA256,
    			ssh.KeyAlgoECDSA384,
    			ssh.KeyAlgoECDSA521,
    			ssh.KeyAlgoED25519,
    		},
    		// optional tcp connect timeout
    		Timeout: 5 * time.Second,
    	}

这样添加是忽略host 的PublicKey校验，官方推荐[ssh.FixedHostKey][]

>     type HostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error
>     func FixedHostKey(key PublicKey) HostKeyCallback
> 
> FixedHostKey returns a function for use in ClientConfig.HostKeyCallback to accept only a specific host key  
> HostKeyCallback is the function type used for verifying server keys. A HostKeyCallback must return nil if the host key is OK, or an error to reject it. It receives the hostname as passed to Dial or NewClientConn. The remote address is the RemoteAddr of the net.Conn underlying the SSH connection.

有兴趣的同学可以参考这个check示例  
[https://github.com/golang/crypto/blob/master/ssh/example\_test.go][https_github.com_golang_crypto_blob_master_ssh_example_test.go]

[ssh.FixedHostKey]: https://godoc.org/golang.org/x/crypto/ssh#FixedHostKey
[https_github.com_golang_crypto_blob_master_ssh_example_test.go]: https://github.com/golang/crypto/blob/master/ssh/example_test.go