Paramiko - 身份验证类型错误 [Cisco SG-300 交换机]
Paramiko - Bad Authentication Type [Cisco SG-300 Switch]
我在下面的ssh上使用配置脚本 link.The 脚本不重要，重要的是导入parmaiko模块。但是我加了一个link:
https://github.com/enessanal/NetConfPy/blob/master/netconf.py
及相关代码：
import paramiko
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
ssh.connect(hostname=host,port=port,username=username,password=password,timeout=timeout)
except Exception as exception:
print(str(exception))
脚本 运行 成功了所有 linux 设备，包括旧型号 HP 交换机，除了一台设备，Cisco SG-300 交换机。我想我明白了这个问题。问题是关于开关。
这种类型的开关表现不同。当使用 ssh 命令或通过 Putty 尝试正常的 ssh 连接时，会出现两种身份验证机制。第一个是“登录身份”，另一个是“用户名”。我们对第二个感兴趣。但是程序（paramiko 客户端）无法绕过“登录为”部分。并每次都抛出“错误的身份验证类型”异常。
我怎么解决这个问题？或者还有其他方法可以通过 ssh 连接自动配置吗？
调试信息：
OpenSSH_7.9p1 Debian-1, OpenSSL 1.1.1 11 Sep 2018
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolve_canonicalize: hostname 10.39.31.11 is address
debug2: ssh_connect_direct
debug1: Connecting to 10.39.31.11 [10.39.31.11] port 22.
debug1: Connection established.
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: identity file /root/.ssh/id_xmss type -1
debug1: identity file /root/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.3p1.RL
debug1: match: OpenSSH_7.3p1.RL pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug2: fd 5 setting O_NONBLOCK
debug1: Authenticating to 10.39.31.11:22 as 'root'
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /root/.ssh/known_hosts:9
debug3: load_hostkeys: loaded 1 keys from 10.39.31.11
debug3: order_hostkeyalgs: prefer hostkeyalgs: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,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,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,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,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305@openssh.com
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305@openssh.com
debug2: MACs ctos: hmac-sha1
debug2: MACs stoc: hmac-sha1
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: diffie-hellman-group14-sha1
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: sending SSH2_MSG_KEXDH_INIT
debug2: bits set: 1001/2048
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ssh-rsa SHA256:dS79N4clCGySrehvWW5kpCRgm3VXlYClD0pyoaYSNoQ
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /root/.ssh/known_hosts:9
debug3: load_hostkeys: loaded 1 keys from 10.34.35.11
debug1: Host '10.39.31.11' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:9
debug2: bits set: 1068/2048
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug1: Will attempt key: /root/.ssh/id_rsa
debug1: Will attempt key: /root/.ssh/id_dsa
debug1: Will attempt key: /root/.ssh/id_ecdsa
debug1: Will attempt key: /root/.ssh/id_ed25519
debug1: Will attempt key: /root/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (none).
Authenticated to 10.39.31.11 ([10.39.31.11]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 5 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x08
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env LS_COLORS
debug3: Ignored env SSH_CONNECTION
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env USER
debug3: Ignored env PWD
debug3: Ignored env HOME
debug3: Ignored env SSH_CLIENT
debug3: Ignored env SSH_TTY
debug3: Ignored env MAIL
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env SHLVL
debug3: Ignored env LOGNAME
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env PATH
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 2097152 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
User Name:wrong_credentils_don't_effect_the_logs
Password:***
User Name:cisco
Password:************
Switch1>exit
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug2: channel 0: output open -> drain
debug2: channel 0: chan_shutdown_read (i0 o1 sock -1 wfd 6 efd 8 [write])
debug2: channel 0: input open -> closed
debug3: channel 0: will not send data after close
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: chan_shutdown_write (i3 o1 sock -1 wfd 7 efd 8 [write])
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 e[write]/0 fd -1/-1/8 sock -1 cc -1)
debug3: send packet: type 1
debug3: fd 1 is not O_NONBLOCK
Connection to 10.39.31.11 closed.
Transferred: sent 3552, received 2776 bytes, in 28.7 seconds
Bytes per second: sent 123.9, received 96.8
debug1: Exit status -1
和 paramiko 日志文件：
DEB [20181204-11:25:17.677] thr=1 paramiko.transport: starting thread (client mode): 0x3c1fed0
DEB [20181204-11:25:17.677] thr=1 paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.4.2
DEB [20181204-11:25:17.695] thr=1 paramiko.transport: Remote version/idstring: SSH-2.0-OpenSSH_7.3p1.RL
INF [20181204-11:25:17.695] thr=1 paramiko.transport: Connected (version 2.0, client OpenSSH_7.3p1.RL)
DEB [20181204-11:25:18.015] thr=1 paramiko.transport: kex algos:['diffie-hellman-group-exchange-sha1', 'diffie-hellman-group1-sha1', 'diffie-hellman-group14-sha1'] server key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] server encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] client mac:['hmac-sha1'] server mac:['hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: Kex agreed: diffie-hellman-group-exchange-sha1
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: HostKey agreed: ssh-rsa
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: Cipher agreed: aes128-ctr
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: MAC agreed: hmac-sha1
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: Compression agreed: none
DEB [20181204-11:25:18.027] thr=1 paramiko.transport: Got server p (2048 bits)
DEB [20181204-11:25:18.459] thr=1 paramiko.transport: kex engine KexGex specified hash_algo <built-in function openssl_sha1>
DEB [20181204-11:25:18.459] thr=1 paramiko.transport: Switch to new keys ...
DEB [20181204-11:25:18.460] thr=2 paramiko.transport: Adding ssh-rsa host key for 10.39.31.11: b'd6d12a09458873202a0e271b90d38a7d'
DEB [20181204-11:25:18.936] thr=1 paramiko.transport: userauth is OK
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Authentication type (password) not permitted.
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Allowed methods: ['']
DEB [20181204-11:25:18.941] thr=1 paramiko.transport: EOF in transport thread
DEB [20181204-11:25:18.946] thr=3 paramiko.transport: starting thread (client mode): 0x386b0f0
DEB [20181204-11:25:18.947] thr=3 paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.4.2
DEB [20181204-11:25:19.245] thr=3 paramiko.transport: Remote version/idstring: SSH-2.0-OpenSSH_7.3p1.RL
INF [20181204-11:25:19.245] thr=3 paramiko.transport: Connected (version 2.0, client OpenSSH_7.3p1.RL)
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: kex algos:['diffie-hellman-group-exchange-sha1', 'diffie-hellman-group1-sha1', 'diffie-hellman-group14-sha1'] server key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] server encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] client mac:['hmac-sha1'] server mac:['hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: Kex agreed: diffie-hellman-group-exchange-sha1
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: HostKey agreed: ssh-rsa
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: Cipher agreed: aes128-ctr
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: MAC agreed: hmac-sha1
DEB [20181204-11:25:19.567] thr=3 paramiko.transport: Compression agreed: none
DEB [20181204-11:25:19.576] thr=3 paramiko.transport: Got server p (2048 bits)
DEB [20181204-11:25:19.946] thr=3 paramiko.transport: kex engine KexGex specified hash_algo <built-in function openssl_sha1>
DEB [20181204-11:25:19.946] thr=3 paramiko.transport: Switch to new keys ...
DEB [20181204-11:25:19.947] thr=2 paramiko.transport: Adding ssh-rsa host key for 10.39.31.11: b'd6d12a09458873202a0e271b90d38a7d'
DEB [20181204-11:25:20.486] thr=3 paramiko.transport: userauth is OK
DEB [20181204-11:25:20.491] thr=3 paramiko.transport: Authentication type (password) not permitted.
DEB [20181204-11:25:20.491] thr=3 paramiko.transport: Allowed methods: ['']
DEB [20181204-11:25:20.492] thr=3 paramiko.transport: EOF in transport thread
异常字符串程序抛出：
[*] Testing connection...
[*] Getting banner...
[+] Banner => SSH-2.0-OpenSSH_7.3p1.RL
[-] Failed to connect => 10.39.31.11:22 (('Bad authentication type', ['']) (allowed_types=['']))
[*] Exiting...
非常感谢。
Cisco ssh connection screen
服务器（交换机）不支持任何SSH认证方式：
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Authentication type (password) not permitted.
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Allowed methods: ['']
它实际上使用简单的 I/O（类似于 Telnet）来提示输入凭据。
当您指示 Paramiko 使用标准 SSH 密码身份验证（通过向 SSHClient.connect() 提供密码）时，它失败了。
Paramiko（与ssh相反）不支持"none"身份验证（或不直接）。
虽然这可能有效：
- 不要向
SSHClient.connect() 提供密码
SSHClient.connect() 应该失败 SSHException('No authentication methods available') - 吞掉那个异常现在您已连接到服务器，但未通过身份验证。要使用 "none" SSH 身份验证进行身份验证，请调用 Transport.auth_none():
ssh.get_transport().auth_none(username)
就 SSH 而言，现在您应该 "authenticated"。同样，ssh 认为它已通过身份验证，甚至在您收到任何凭据提示之前也是如此：
debug1: Authentication succeeded (none).
Authenticated to 10.39.31.11 ([10.39.31.11]:22).
...
User Name:wrong_credentils_don't_effect_the_logs
Password:***
User Name:cisco
Password:************
然后，如果您尝试使用 SSHClient.invoke_shell() 打开 "shell"（也可能如果您尝试使用 SSHClient.exec_command() 执行命令 - 尽管我假设服务器不会' t 支持此接口），服务器将使用 I/O.
提示您输入用户名和密码
尝试以这种方式提供凭据：
channel = ssh.invoke_shell()
channel.send(username + "\n")
channel.send(password + "\n")
（如果服务器不接受，则在提供凭据之前可能需要等待提示 [expect-like]）。
强制警告：不要使用AutoAddPolicy，除非你不关心安全。这样你就失去了对 MITM 攻击的保护。
有关正确的解决方案，请参阅 Paramiko "Unknown Server".
将以下内容添加到您的 Cisco SG3XX 配置中：
ip ssh password-auth
这将使用 paramiko 期望的 SSH 密码身份验证，而不是使用基于 shell 的身份验证。
我在下面的ssh上使用配置脚本 link.The 脚本不重要，重要的是导入parmaiko模块。但是我加了一个link:
https://github.com/enessanal/NetConfPy/blob/master/netconf.py
及相关代码：
import paramiko
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
ssh.connect(hostname=host,port=port,username=username,password=password,timeout=timeout)
except Exception as exception:
print(str(exception))
脚本 运行 成功了所有 linux 设备，包括旧型号 HP 交换机，除了一台设备，Cisco SG-300 交换机。我想我明白了这个问题。问题是关于开关。 这种类型的开关表现不同。当使用 ssh 命令或通过 Putty 尝试正常的 ssh 连接时，会出现两种身份验证机制。第一个是“登录身份”，另一个是“用户名”。我们对第二个感兴趣。但是程序（paramiko 客户端）无法绕过“登录为”部分。并每次都抛出“错误的身份验证类型”异常。 我怎么解决这个问题？或者还有其他方法可以通过 ssh 连接自动配置吗？
调试信息：
OpenSSH_7.9p1 Debian-1, OpenSSL 1.1.1 11 Sep 2018
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolve_canonicalize: hostname 10.39.31.11 is address
debug2: ssh_connect_direct
debug1: Connecting to 10.39.31.11 [10.39.31.11] port 22.
debug1: Connection established.
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: identity file /root/.ssh/id_xmss type -1
debug1: identity file /root/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.3p1.RL
debug1: match: OpenSSH_7.3p1.RL pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug2: fd 5 setting O_NONBLOCK
debug1: Authenticating to 10.39.31.11:22 as 'root'
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /root/.ssh/known_hosts:9
debug3: load_hostkeys: loaded 1 keys from 10.39.31.11
debug3: order_hostkeyalgs: prefer hostkeyalgs: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,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,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,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,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305@openssh.com
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305@openssh.com
debug2: MACs ctos: hmac-sha1
debug2: MACs stoc: hmac-sha1
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: diffie-hellman-group14-sha1
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: sending SSH2_MSG_KEXDH_INIT
debug2: bits set: 1001/2048
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ssh-rsa SHA256:dS79N4clCGySrehvWW5kpCRgm3VXlYClD0pyoaYSNoQ
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /root/.ssh/known_hosts:9
debug3: load_hostkeys: loaded 1 keys from 10.34.35.11
debug1: Host '10.39.31.11' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:9
debug2: bits set: 1068/2048
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug1: Will attempt key: /root/.ssh/id_rsa
debug1: Will attempt key: /root/.ssh/id_dsa
debug1: Will attempt key: /root/.ssh/id_ecdsa
debug1: Will attempt key: /root/.ssh/id_ed25519
debug1: Will attempt key: /root/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (none).
Authenticated to 10.39.31.11 ([10.39.31.11]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 5 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x08
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env LS_COLORS
debug3: Ignored env SSH_CONNECTION
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env USER
debug3: Ignored env PWD
debug3: Ignored env HOME
debug3: Ignored env SSH_CLIENT
debug3: Ignored env SSH_TTY
debug3: Ignored env MAIL
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env SHLVL
debug3: Ignored env LOGNAME
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env PATH
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 2097152 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
User Name:wrong_credentils_don't_effect_the_logs
Password:***
User Name:cisco
Password:************
Switch1>exit
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug2: channel 0: output open -> drain
debug2: channel 0: chan_shutdown_read (i0 o1 sock -1 wfd 6 efd 8 [write])
debug2: channel 0: input open -> closed
debug3: channel 0: will not send data after close
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: chan_shutdown_write (i3 o1 sock -1 wfd 7 efd 8 [write])
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 e[write]/0 fd -1/-1/8 sock -1 cc -1)
debug3: send packet: type 1
debug3: fd 1 is not O_NONBLOCK
Connection to 10.39.31.11 closed.
Transferred: sent 3552, received 2776 bytes, in 28.7 seconds
Bytes per second: sent 123.9, received 96.8
debug1: Exit status -1
和 paramiko 日志文件：
DEB [20181204-11:25:17.677] thr=1 paramiko.transport: starting thread (client mode): 0x3c1fed0
DEB [20181204-11:25:17.677] thr=1 paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.4.2
DEB [20181204-11:25:17.695] thr=1 paramiko.transport: Remote version/idstring: SSH-2.0-OpenSSH_7.3p1.RL
INF [20181204-11:25:17.695] thr=1 paramiko.transport: Connected (version 2.0, client OpenSSH_7.3p1.RL)
DEB [20181204-11:25:18.015] thr=1 paramiko.transport: kex algos:['diffie-hellman-group-exchange-sha1', 'diffie-hellman-group1-sha1', 'diffie-hellman-group14-sha1'] server key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] server encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] client mac:['hmac-sha1'] server mac:['hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: Kex agreed: diffie-hellman-group-exchange-sha1
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: HostKey agreed: ssh-rsa
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: Cipher agreed: aes128-ctr
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: MAC agreed: hmac-sha1
DEB [20181204-11:25:18.016] thr=1 paramiko.transport: Compression agreed: none
DEB [20181204-11:25:18.027] thr=1 paramiko.transport: Got server p (2048 bits)
DEB [20181204-11:25:18.459] thr=1 paramiko.transport: kex engine KexGex specified hash_algo <built-in function openssl_sha1>
DEB [20181204-11:25:18.459] thr=1 paramiko.transport: Switch to new keys ...
DEB [20181204-11:25:18.460] thr=2 paramiko.transport: Adding ssh-rsa host key for 10.39.31.11: b'd6d12a09458873202a0e271b90d38a7d'
DEB [20181204-11:25:18.936] thr=1 paramiko.transport: userauth is OK
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Authentication type (password) not permitted.
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Allowed methods: ['']
DEB [20181204-11:25:18.941] thr=1 paramiko.transport: EOF in transport thread
DEB [20181204-11:25:18.946] thr=3 paramiko.transport: starting thread (client mode): 0x386b0f0
DEB [20181204-11:25:18.947] thr=3 paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.4.2
DEB [20181204-11:25:19.245] thr=3 paramiko.transport: Remote version/idstring: SSH-2.0-OpenSSH_7.3p1.RL
INF [20181204-11:25:19.245] thr=3 paramiko.transport: Connected (version 2.0, client OpenSSH_7.3p1.RL)
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: kex algos:['diffie-hellman-group-exchange-sha1', 'diffie-hellman-group1-sha1', 'diffie-hellman-group14-sha1'] server key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] server encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] client mac:['hmac-sha1'] server mac:['hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: Kex agreed: diffie-hellman-group-exchange-sha1
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: HostKey agreed: ssh-rsa
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: Cipher agreed: aes128-ctr
DEB [20181204-11:25:19.566] thr=3 paramiko.transport: MAC agreed: hmac-sha1
DEB [20181204-11:25:19.567] thr=3 paramiko.transport: Compression agreed: none
DEB [20181204-11:25:19.576] thr=3 paramiko.transport: Got server p (2048 bits)
DEB [20181204-11:25:19.946] thr=3 paramiko.transport: kex engine KexGex specified hash_algo <built-in function openssl_sha1>
DEB [20181204-11:25:19.946] thr=3 paramiko.transport: Switch to new keys ...
DEB [20181204-11:25:19.947] thr=2 paramiko.transport: Adding ssh-rsa host key for 10.39.31.11: b'd6d12a09458873202a0e271b90d38a7d'
DEB [20181204-11:25:20.486] thr=3 paramiko.transport: userauth is OK
DEB [20181204-11:25:20.491] thr=3 paramiko.transport: Authentication type (password) not permitted.
DEB [20181204-11:25:20.491] thr=3 paramiko.transport: Allowed methods: ['']
DEB [20181204-11:25:20.492] thr=3 paramiko.transport: EOF in transport thread
异常字符串程序抛出：
[*] Testing connection...
[*] Getting banner...
[+] Banner => SSH-2.0-OpenSSH_7.3p1.RL
[-] Failed to connect => 10.39.31.11:22 (('Bad authentication type', ['']) (allowed_types=['']))
[*] Exiting...
非常感谢。
Cisco ssh connection screen
服务器（交换机）不支持任何SSH认证方式：
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Authentication type (password) not permitted.
DEB [20181204-11:25:18.940] thr=1 paramiko.transport: Allowed methods: ['']
它实际上使用简单的 I/O（类似于 Telnet）来提示输入凭据。
当您指示 Paramiko 使用标准 SSH 密码身份验证（通过向 SSHClient.connect() 提供密码）时，它失败了。
Paramiko（与ssh相反）不支持"none"身份验证（或不直接）。
虽然这可能有效：
- 不要向
SSHClient.connect() 提供密码
SSHClient.connect()应该失败SSHException('No authentication methods available')- 吞掉那个异常现在您已连接到服务器，但未通过身份验证。要使用 "none" SSH 身份验证进行身份验证，请调用
Transport.auth_none():ssh.get_transport().auth_none(username)
就 SSH 而言，现在您应该 "authenticated"。同样，ssh 认为它已通过身份验证，甚至在您收到任何凭据提示之前也是如此：
debug1: Authentication succeeded (none).
Authenticated to 10.39.31.11 ([10.39.31.11]:22).
...
User Name:wrong_credentils_don't_effect_the_logs
Password:***
User Name:cisco
Password:************
然后，如果您尝试使用 SSHClient.invoke_shell() 打开 "shell"（也可能如果您尝试使用 SSHClient.exec_command() 执行命令 - 尽管我假设服务器不会' t 支持此接口），服务器将使用 I/O.
尝试以这种方式提供凭据：
channel = ssh.invoke_shell()
channel.send(username + "\n")
channel.send(password + "\n")
（如果服务器不接受，则在提供凭据之前可能需要等待提示 [expect-like]）。
强制警告：不要使用AutoAddPolicy，除非你不关心安全。这样你就失去了对 MITM 攻击的保护。
有关正确的解决方案，请参阅 Paramiko "Unknown Server".
将以下内容添加到您的 Cisco SG3XX 配置中：
ip ssh password-auth
这将使用 paramiko 期望的 SSH 密码身份验证，而不是使用基于 shell 的身份验证。