我这次又采用了大众化的密钥算法 RSA 还是认证失败，并且我发下，在 centos7.3或者7.4

之后，即使在 bash shell 用 Linux 命令执行   

ssh  192.168.1.107 的时候，默认反回的服务器端 1.07 的的公钥，但是这个公钥

的加密算法不是 RSA, 是 ECDSA

当我用 paramiko 采用任何算法都是认证失败

In [1]: import paramiko

In [2]: ssh = paramiko.SSHClient()

In [3]: ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

In [4]: kf = paramiko.RSAKey.from_private_key_file('/root/.ssh/id_rsa')

In [5]: ssh.connect('192.168.1.107',22,'root',pkey=kf)

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

AuthenticationException                   Traceback (most recent call last)

<ipython-input-5-2e01dff70681> in <module>()

----> 1 ssh.connect('192.168.1.107',22,'root',pkey=kf)

~/virtualenv/skops/lib/python3.6/site-packages/paramiko/client.py in connect(self, hostname, port, username, password, pkey, key_filename, timeout, allow_agent, look_for_keys, compress, sock, gss_auth, gss_kex, gss_deleg_creds, gss_host, banner_timeout, auth_timeout, gss_trust_dns, passphrase)

    422             username, password, pkey, key_filenames, allow_agent,

    423             look_for_keys, gss_auth, gss_kex, gss_deleg_creds, t.gss_host,

--> 424             passphrase,

    425         )

    426

~/virtualenv/skops/lib/python3.6/site-packages/paramiko/client.py in _auth(self, username, password, pkey, key_filenames, allow_agent, look_for_keys, gss_auth, gss_kex, gss_deleg_creds, gss_host, passphrase)

    712         # if we got an auth-failed exception earlier, re-raise it

    713         if saved_exception is not None:

--> 714             raise saved_exception

    715         raise SSHException('No authentication methods available')

    716

~/virtualenv/skops/lib/python3.6/site-packages/paramiko/client.py in _auth(self, username, password, pkey, key_filenames, allow_agent, look_for_keys, gss_auth, gss_kex, gss_deleg_creds, gss_host, passphrase)

    689                     # in ['password']

    690                     allowed_types = set(

--> 691                         self._transport.auth_publickey(username, key))

    692                     two_factor = (allowed_types & two_factor_types)

    693                     if not two_factor:

~/virtualenv/skops/lib/python3.6/site-packages/paramiko/transport.py in auth_publickey(self, username, key, event)

   1448             # caller wants to wait for event themselves

   1449             return []

-> 1450         return self.auth_handler.wait_for_response(my_event)

   1451

   1452     def auth_interactive(self, username, handler, submethods=''):

~/virtualenv/skops/lib/python3.6/site-packages/paramiko/auth_handler.py in wait_for_response(self, event)

    224             if issubclass(e.__class__, PartialAuthentication):

    225                 return e.allowed_types

--> 226             raise e

    227         return []

    228

AuthenticationException: Authentication failed.

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服务端的 .ssh 相关信息如下：

[root@docker1 ~]# ls -ld .ssh/

drwx------. 2 root root 104 2月   4 10:02 .ssh/

[root@docker1 ~]# ls -ld .ssh/*

-rw------- 1 root root  395 2月   4 08:47 .ssh/authorized_keys

-rw------- 1 root root 1675 2月   4 08:17 .ssh/id_rsa

-rw-r--r-- 1 root root  394 2月   4 08:17 .ssh/id_rsa.pub

-rw-r--r-- 1 root root 1144 2月   4 08:17 .ssh/known_hosts

=-------------------

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

客户端的配置文件  sshd_config 内容如下

========================================

Protocol 2

HostKey /etc/ssh/ssh_host_rsa_key

HostKey /etc/ssh/ssh_host_ecdsa_key

HostKey /etc/ssh/ssh_host_ed25519_key

SyslogFacility AUTHPRIV

RSAAuthentication yes

PubkeyAuthentication yes

AuthorizedKeysFile .ssh/authorized_keys

PasswordAuthentication yes

ChallengeResponseAuthentication no

GSSAPIAuthentication no

GSSAPICleanupCredentials no

UsePAM yes

X11Forwarding yes

UsePrivilegeSeparation sandbox # Default for new installations.

UseDNS no

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

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