ssh-copy-id 成功，但還是提示輸入密碼

1. 我以前ssh-copy-id root@c199成功過。
2. 我可以在ssh root@c199沒有密碼提示的情況下登錄
3. 我想由另一個使用者自動登錄ufo （遠端機器有這個使用者）
4. ssh-copy-id ufo@c199 問我輸入密碼，

/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. 但是通過ssh ufo@c199仍然提示輸入密碼登錄。

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我嘗試通過 ssh 在 msys2（在 Windows 上）上登錄遠端 centos，我發現有很多相同的行，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

以美分為/home/ufo/.ssh/authorized_keys單位

我已將 .ssh 使用者的文件夾權限更改為 700 並將 authorized_keys 文件更改為 644 。

相同的ssh密鑰，無提示ssh root@c199登錄，但ssh ufo@c199提示輸入密碼..

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更新

ssh ufo@c199 -vv輸出：

....
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

感謝https://unix.stackexchange.com/a/55481/106419，它告訴我如何調試 ssh。

啟用 ssh 調試以查看發生了什麼

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

我發現：

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

所有人只說：

• /home/ufo/.ssh所有權正確 700
• /home/ufo/.ssh/authorized_keys所有權正確 600/644

但是 sshd 仍然檢查使用者主文件夾！！！沒有人提到這個！

sudo chmod 700 /home/ufo解決這個問題。

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概括：

您需要確保：

• /home/ufo所有權為 700
• /home/ufo/.ssh所有權為 700
• /home/ufo/.ssh/authorized_keys 所有權為 600

將 ufo 更改為您的主文件夾名稱

引用自：https://unix.stackexchange.com/questions/407394