Linux
ssh 和本地 root 登錄在 Debian 9 中使用無效密碼
我正在嘗試在本地和通過 ssh 使用 root 使用者名登錄到 Debian 9 機器。它使用任何無效密碼登錄。我只想使用正確的密碼訪問機器。為什麼 root 帳戶的無效密碼有效？如何修復它，因此需要在本地和通過 ssh 輸入正確的密碼？
對於 ssh，我只允許 root 使用者。有趣的是，當我將 UsePAM 更改為 no 時，它可以使用正確的 root 密碼。
ssh 調試結果：
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 * debug1: Connecting to 192.168.56.101 [192.168.56.101] 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_7.4p1 Debian-10+deb9u4 debug1: match: OpenSSH_7.4p1 Debian-10+deb9u4 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 localhost: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: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ecdsa-sha2-nistp256 SHA256:>>>>>>>>>>>>>>>>>>>>>>>>>>>>> debug1: Host 'localhost' is known and matches the ECDSA host key. debug1: Found key in /root/.ssh/known_hosts:3 debug1: rekey after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received 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 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: Trying private key: /root/.ssh/id_rsa debug1: Trying private key: /root/.ssh/id_dsa debug1: Trying private key: /root/.ssh/id_ecdsa debug1: Trying private key: /root/.ssh/id_ed25519 debug1: Trying private key: /root/.ssh/id_xmss debug1: Next authentication method: password debug1: Authentication succeeded (password). Authenticated to localhost ([localhost]: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: Sending environment. debug1: Sending env LANG = en_US.UTF-8 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 debug1: channel 0: free: client-session, nchannels 1 debug1: fd 2 clearing O_NONBLOCK Connection to localhost closed. Transferred: sent 2356, received 6188 bytes, in 7.3 seconds Bytes per second: sent 321.4, received 844.0 debug1: Exit status 0
我解決了。PAM 包含不同的文件，其中一個文件 common-auth 配置錯誤。任何無效登錄都有拒絕狀態，所以我更改了它並解決了問題。