無需密碼的兩步遠端ssh

我正在尋找從我的 localhost 到遠端伺服器的 ssh，然後從那裡到遠端電腦。我目前已經設置好了，以便遠端電腦和遠端伺服器在它們之間設置無密碼 ssh-ing，但是如果我從本地主機 ssh 到伺服器，然後嘗試從那裡 ssh 到電腦，我得到：

Enter passphrase for key '/home/user/.ssh/id_dsa': 
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive).

如果我嘗試從遠端伺服器上打開的終端 ssh 到遠端電腦，它工作得很好。這與我的顯示不存在:0.0有關，還是完全與其他有關？我已經嘗試過xhost +local:，但已經迷失了。

謝謝

如果兩個系統都有本地系統的公鑰，請使用-A.

從ssh(1)

-A      Enables forwarding of the authentication agent connection.  This
        can also be specified on a per-host basis in a configuration file.

另請注意此警告：

        Agent forwarding should be enabled with caution.  Users with the
        ability to bypass file permissions on the remote host (for the
        agent's UNIX-domain socket) can access the local agent through the
        forwarded connection.  An attacker cannot obtain key material from
        the agent, however they can perform operations on the keys that
        enable them to authenticate using the identities loaded into the
        agent.

結果是，當您針對第二台主機進行身份驗證時，身份驗證會一直轉發回您實際居住的主機。

例子：

me@host0:~ $ ssh -A host1
Last login: Thu Jun 14 11:31:53 2012 from 2001:db8::b0
me@host1:~ $ ssh -A host2
Last login: Thu Jun 14 11:41:05 2012 from 2001:db8::b1
me@host3:~ $ ssh -A host3
Last login: Tue Jun 12 10:46:50 2012 from 2001:db8::b2
me@host3:~ $ 

引用自：https://unix.stackexchange.com/questions/40744