Loading... 针对此类问题首先可以在客户端使用`ssh -vT user@domain.com`来展示更详细的`ssh`过程，但是这通常无法得到更多有用的信息，此时可以尝试在目标机器上`tail -f /var/log/secure`来查看`ssh`的日志信息。 ```bash # ssh -vT user@domain.com OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5 debug1: Reading configuration data C:\\Users\\Fat Tiger/.ssh/config debug1: Connecting to git.jackyzhong.com [47.102.116.218] port 22. debug1: Connection established. debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_rsa type 0 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_ed25519-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_xmss type -1 debug1: key_load_public: No such file or directory debug1: identity file C:\\Users\\Fat Tiger/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_for_Windows_7.7 debug1: Remote protocol version 2.0, remote software version OpenSSH_8.0 debug1: match: OpenSSH_8.0 pat OpenSSH* compat 0x04000000 debug1: Authenticating to git.jackyzhong.com:22 as 'git' 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:pkY5IbHPHc5IBKjcHV01CTCR6YOPxXjTyOuYThvWh2w debug1: Host 'git.jackyzhong.com' is known and matches the ECDSA host key. debug1: Found key in C:\\Users\\Fat Tiger/.ssh/known_hosts:52 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: pubkey_prepare: ssh_get_authentication_socket: No such file or directory debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521> debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Offering public key: RSA SHA256:zVBT1hcHvvBpj1+85qPdUDu96JAF8uTCFhFeqxiOW3w C:\\Users\\Fat Tiger/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Trying private key: C:\\Users\\Fat Tiger/.ssh/id_dsa debug1: Trying private key: C:\\Users\\Fat Tiger/.ssh/id_ecdsa debug1: Trying private key: C:\\Users\\Fat Tiger/.ssh/id_ed25519 debug1: Trying private key: C:\\Users\\Fat Tiger/.ssh/id_xmss debug1: Next authentication method: password debug1: read_passphrase: can't open /dev/tty: No such file or directory ``` ```bash # tail -f /var/log/secure Jun 16 22:23:33 sshd[20543]: Authentication refused: bad ownership or modes for directory xxxxxx Jun 16 22:23:35 sshd[20543]: Connection reset by authenticating user xxxxx port 2016 [preauth] ``` 另外在`Centos`上`.ssh`目录需要`700`权限而`authorized_keys`文件需要`600`权限，权限过高或过低都会导致`ssh`失败，也可以通过修改`ssh_config`文件设置`StrictModes off`取消此限制，但是没必要，修复权限通常是正确的做法。 # Reference * [SSH Authentication Refused: Bad Ownership or Modes for Directory](https://www.daveperrett.com/articles/2010/09/14/ssh-authentication-refused) 最后修改：2020 年 09 月 22 日 © 允许规范转载 赞 0 如果觉得我的文章对你有用，请随意赞赏