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SSH 不断跳过我的公钥并要求输入密码

tag-icon • tag-icon ssh password authentication
SSH 不断跳过我的公钥并要求输入密码

每次我通过 ssh 连接到远程服务器时，都需要提供密码。我使用以下命令将公钥 (id_dsa.pub) 复制到远程服务器：

ssh-copy-id -i id_dsa.pub user@server

我检查它是否已正确添加到authorized_keys中。所有文件/目录权限均正确：

~user 755
~user/.ssh 700
~user/.ssh/authorized_keys 640
~user/.ssh/id_dsa.pub 644

/etc/ssh/sshd_config 中的PasswordAuthentication 字段设置为yes。我将 sshd 置于调试模式，并将详细开关添加到 ssh 命令中。我的印象是服务器没有尝试使用 id_pub.dsa 因为该行

Skipping ssh-dss key: ........... not in PubkeyAcceptedKeyTypes

服务器端没有加密光盘。有什么想法如何进步吗？这是 ssh 守护进程调试信息：

sudo /usr/sbin/sshd -d
====
debug1: sshd version OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type ECDSA
debug1: private host key: #2 type 3 ECDSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
Set /proc/self/oom_score_adj from 0 to -1000
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from xxx port 63521 on yyy port 22
debug1: Client protocol version 2.0; client software version OpenSSH_7.1
debug1: match: OpenSSH_7.1 pat OpenSSH* compat 0x04000000
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.3
debug1: permanently_set_uid: 115/65534 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: client->server [email protected] <implicit> none [preauth]
debug1: kex: server->client [email protected] <implicit> none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user damian service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
debug1: PAM: initializing for "damian"
debug1: PAM: setting PAM_RHOST to "freebox-server.local"
debug1: PAM: setting PAM_TTY to "ssh"
Connection closed by xxxx [preauth]
debug1: do_cleanup [preauth]
debug1: monitor_read_log: child log fd closed
debug1: do_cleanup

这是 ssh 详细输出：

$ ssh -v user@server
OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015
debug1: Connecting to server [xxxx] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_rsa-cert type -1
debug1: identity file /home/user/.ssh/id_dsa type 2
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.3
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.3 pat OpenSSH_6.6.1* compat 0x04000000
debug1: Authenticating to server:22 as 'user'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client [email protected] <implicit> none
debug1: kex: client->server [email protected] <implicit> none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:v4BNHM0Q33Uh6U4VHenA9iJ0wEyi8h0rFVetbcXBKqA
debug1: Host 'server' is known and matches the ECDSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:2
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,password
debug1: Next authentication method: publickey
debug1: Trying private key: /home/user/.ssh/id_rsa
debug1: Skipping ssh-dss key /home/user/.ssh/id_dsa for not in PubkeyAcceptedKeyTypes
debug1: Trying private key: /home/user/.ssh/id_ecdsa
debug1: Trying private key: /home/user/.ssh/id_ed25519
debug1: Next authentication method: password
user@server's password:

答案1

新的openssh版本（7.0+）已弃用的 DSA 密钥并且默认情况下不使用 DSA 密钥（服务器或客户端上均不使用）。不再推荐使用这些密钥，因此如果可以的话，我建议使用 RSA 密钥在可能的情况。

如果您确实需要使用 DSA 密钥，则需要使用以下命令在客户端配置中显式允许它们

PubkeyAcceptedKeyTypes +ssh-dss

应该足以将该行放入 中~/.ssh/config，因为详细消息试图告诉您。

答案2

就我而言，我遇到此问题是因为另一个用户更改了AuthorizedKeysFile位置。由于此位置没有authorized_keys其他用户，因此即使authorized_keys在默认主目录中具有正确的权限，登录也将默认使用密码。

AuthorizedKeysFile   /etc/ssh/%u/authorized_keys

将此修改后的行注释掉并重新启动 sshd 服务以返回到默认设置，然后允许其他用户使用其密钥进行身份验证。

答案3

我尝试了 Jakuje 的回答，但没有成功。但我从那里理解了问题。尝试添加评论，但需要声誉，这就是为什么添加 anwser。

但我的配置文件 /etc/ssh/ssh_config

  1. sudo nano /etc/ssh/ssh_config
  2. PubkeyAcceptedKeyTypes +ssh-dss在底部添加了这一行。
  3. 保存并重试。

成功了！

答案4

DSA不适合我。RSA做过。

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cat /Users/user_name/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

我可以在没有密码的情况下进行 ssh。

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