ssh-copy-id 成功了，但是还是提示输入密码

Question

1. 我以前ssh-copy-id root@c199成功过。
2. 我可以在ssh root@c199没有密码提示的情况下登录
3. 我想由另一个用户自动登录ufo （远程机器有这个用户）

4. ssh-copy-id ufo@c199 要求我输入密码，

   /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
   /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
   ufo@c199's password:
   
   Number of key(s) added: 1
   
   Now try logging into the machine, with:   "ssh 'ufo@c199'"
   and check to make sure that only the key(s) you wanted were added.
   

5. 但是登录ssh ufo@c199还是提示输入密码。

---

我尝试通过 ssh 在 msys2（在 Windows 上）上登录远程 centos，我发现有很多相同的行，例如

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCs7RTfvn83Rxdmvgfh+F4kUlM5FzIUb9rRHaqq11xKIW1gztn/+G4tr+OWl4o6GTW2Z361hIi
ugy8DPtMATN66nTTDUYO0sSvw2BrQfDY4iIENdLpkkHO8KQVGpQE+8tDkaZfD6EQLVtl0uvDE3D77tfcnBLODXgZPQsUSlssMi+pxDbSVjjKgrP
hM1G/L9OTrEHKWDhF+ZBgY1RuLl7ZEdoATbhJaK4FFb9hNn/2CSibVfLts8HJGYQXIQRX/RBzaDZp47sKZvq302ewkkVorNY+c9mmoze6mi8Ip2
zEQOMi6S9zM/yRiD0XZrbmzYfNkoXA03WTmMR/DynVvX2nV /c/Users/xxxx/.ssh/id_rsa

在 centos 中/home/ufo/.ssh/authorized_keys，

我已将 .ssh 用户的文件夹权限更改为 700 ，并将 authorized_keys 文件更改为 644 。

相同的 ssh 密钥，ssh root@c199无ssh ufo@c199提示登录，但提示输入密码..

---

更新

ssh ufo@c199 -vv 输出：

....
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:zmCg5vHhBAMd5P4ei82+KsVg072KXbC63C44P0w3zbU
debug1: Host 'c199' is known and matches the ECDSA host key.
debug1: Found key in /c/Users/xxxxx/.ssh/known_hosts:35
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /c/Users/xxxxx/.ssh/id_rsa (0x60006bec0), agent
debug2: key: /c/Users/xxxxx/.ssh/id_dsa (0x0)
debug2: key: /c/Users/xxxxx/.ssh/id_ecdsa (0x0)
debug2: key: /c/Users/xxxxx/.ssh/id_ed25519 (0x0)
debug2: service_accept: ssh-userauth
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 RSA public key: /c/Users/xxxxx/.ssh/id_rsa
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /c/Users/xxxxx/.ssh/id_dsa
debug1: Trying private key: /c/Users/xxxxx/.ssh/id_ecdsa
debug1: Trying private key: /c/Users/xxxxx/.ssh/id_ed25519
debug2: we did not send a packet, disable method
debug1: Next authentication method: password

Answer 1

感谢https://unix.stackexchange.com/a/55481/106419，它告诉我如何调试 ssh。

启用 ssh 调试以查看发生了什么

systemctl stop sshd
/usr/sbin/sshd -d -p 22

我发现：

Authentication refused: bad ownership or modes for directory /home/ufo

大家只说：

• /home/ufo/.ssh 所有权正确 700
• /home/ufo/.ssh/authorized_keys 所有权正确 600/644

但是 sshd 仍然检查用户主文件夹！！！没有人提到这一点！

sudo chmod 700 /home/ufo 解决这个问题。

概括：

您需要确保：

• /home/ufo 所有权是 700
• /home/ufo/.ssh 所有权是 700
• /home/ufo/.ssh/authorized_keys 所有权是 600

将 ufo 更改为您的主文件夹名称