我试图从我的机器ssh到另一台机器，从那里到第三台机器。 当我手动执行，它的工作原理是这样的：
localhost$ scp ~/.ssh/id_rsa [email protected]:. localhost$ ssh [email protected] myhost.something.something.com$ ssh -i id_rsa [email protected] 10.25.100.42$ 但我想直接做，一步到位。 我希望从本地主机的SSH密钥转发到第三台机器。 我认为这会工作，但它不会：
localhost$ ssh -A -t [email protected] ssh 10.25.100.42 Permission denied (publickey). Connection to myhost.something.something.com closed.
为什么？ 我怎么能在一个单一的命令从localhost做到这一点？ 以下是我使用详细标志时可以看到的更多细节：
localhost$ ssh -v -A -t [email protected] ssh 10.25.100.42 OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: Connecting to myhost.something.something.com [XXXX] port 22. debug1: Connection established. debug1: identity file /home/myuser/.ssh/id_rsa type 1 debug1: identity file /home/myuser/.ssh/id_rsa-cert type -1 debug1: identity file /home/myuser/.ssh/id_dsa type -1 debug1: identity file /home/myuser/.ssh/id_dsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH* debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr [email protected] none debug1: kex: client->server aes128-ctr [email protected] none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA 62:d2:58:47:f7:c6:21:b4:a1:b0:cf:4e:44:42:e4:9a debug1: Host 'myhost.something.something.com' is known and matches the RSA host key. debug1: Found key in /home/myuser/.ssh/known_hosts:255 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /home/myuser/.ssh/id_rsa debug1: Server accepts key: pkalg ssh-rsa blen 279 debug1: read PEM private key done: type RSA debug1: Authentication succeeded (publickey). Authenticated to myhost.something.something.com ([XXXX]:22). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Requesting authentication agent forwarding. debug1: Sending command: ssh 10.25.100.42 debug1: client_input_channel_open: ctype [email protected] rchan 2 win 65536 max 16384 debug1: channel 1: new [authentication agent connection] debug1: confirm [email protected] Permission denied (publickey). debug1: channel 1: FORCE input drain debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0 debug1: channel 0: free: client-session, nchannels 2 debug1: channel 1: free: authentication agent connection, nchannels 1 Connection to myhost.something.something.com closed. Transferred: sent 3532, received 3312 bytes, in 4.4 seconds Bytes per second: sent 796.1, received 746.6 debug1: Exit status 255
如果要将连接转发到身份validation代理，则需要在您的计算机上运行身份validation代理。 你可以使用ssh-add -l来检查它。 如果没有运行，请启动它并添encryption钥：
eval `ssh-agent` ssh-add ~/.ssh/id_rsa # or other keys you want to use from the other server
然后在使用-A开关连接到另一台服务器之后，您将可以使用此密钥进一步进行身份validation：
local $ ssh -A [email protected] something $ ssh-add -l # should list your key something $ ssh 10.25.100.42
但是你真正想要达到的是不同的东西。 您希望使用第一台主机作为连接到第二台主机的跳转盘，使用ProxyCommand可以使其变得更加方便：
ssh -oProxyCommand="ssh -W 10.25.100.42:22" [email protected]
或更好与.ssh/config ：
Host something Hostname myhost.something.something.com User myuser Host second Hostname 10.25.100.42 User myuser ProxyCommand ssh -W %h:%p something
然后你会到那里使用
ssh second