通過 SSH 連接時出現語法錯誤

當使用我的 openSUSE 15.1 機器通過 ssh 連接到一些 linux 伺服器時，我得到了奇怪的 EOF 和語法錯誤。我幾乎執行了一個標准設置，除了啟用 pubkey 身份驗證之外沒有更改任何內容。

這就是發生的事情：

~> ssh randomserver.hostname
bash: -c: line 0: unexpected EOF while looking for matching `"'
bash: -c: line 1: syntax error: unexpected end of file
Connection to randomserver.hostname closed.

在斷開連接之前，錯誤是在我的本地電腦上生成還是源自遠端伺服器？

的輸出ssh -v是：

~> ssh -v randomserver.hostname
OpenSSH_7.9p1, OpenSSL 1.1.0i-fips  14 Aug 2018
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: Connecting to randomserver.hostname [192.168.1.2] port 22.
debug1: Connection established.
debug1: identity file /home/myuser/.ssh/id_rsa type 0
debug1: identity file /home/myuser/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Debian-10+deb9u7
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u7 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
debug1: Authenticating to randomserver.hostname:22 as 'root'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
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: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXx
debug1: Host 'randomserver.hostname' is known and matches the ECDSA host key.
debug1: Found key in /home/myuser/.ssh/known_hosts
debug1: rekey after 134572247 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134572548 blocks
debug1: Will attempt key: /home/myuser/.ssh/id_rsa XXXX
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering public key: /home/myuser/.ssh/id_rsa XXXX
debug1: Server accepts key: /home/myuser/.ssh/id_rsa XXXX
debug1: Authentication succeeded (publickey).
Authenticated to randomserver.hostname ([192.168.1.2]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Remote: Forced command.
debug1: Remote: Forced command.
debug1: Requesting authentication agent forwarding.
debug1: Sending environment.
debug1: Sending env LANG = de_DE.utf8
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0
bash: -c: line 0: unexpected EOF while looking for matching `"'
bash: -c: line 1: syntax error: unexpected end of file
debug1: channel 0: free: client-session, nchannels 1
Connection to randomserver.hostname closed.
Transferred: sent 3864, received 3020 bytes, in 0.1 seconds
Bytes per second: sent 75479.5, received 58992.8
debug1: Exit status 1

在不更改所有遠端配置的情況下，我可以做些什麼來解決這個問題？

在該.ssh/authorized_keys文件中，您可以強制在登錄之前執行命令。可以在那裡找到語法錯誤（使用command=""）。

這已用於使用唯一密鑰標識符（除了 IP 地址和主機名）將任何管理員的登錄記錄到系統日誌中。

好像登錄後，bash正在嘗試為您自動執行命令。

嘗試使用如下顯式命令登錄：

$ ssh -t randomserver.hostname "bash --norc --noprofile"

如果可行，那麼在給你一個 shell 之前檢查 bash 載入的文件，搜尋任何不尋常的行或語法錯誤。

引用自：https://unix.stackexchange.com/questions/558571