SSH 免密钥登录， Mac 登录 VPS(Ubuntu)可以,登录另一个 Mac 始终失败

看看 Mac 服务器端的日志

试下是不是这个原因

ssh-add --apple-use-keychain ~/.ssh/[your-private-key]

@adoal 抱歉我不是很熟悉，如果是指 /var/log/system.log 里 sshd 相关信息的话，检查了似乎没有
@crab 谢谢帮助，我成功添加了，但还是始终提示需要密钥

确认远程 Mac 的 SSH 设置是否允许该用户登录(在共享里面)，默认是只允许管理员通过 SSH 登录的

看 sshd 的啰嗦模式信息

在 server 端用 -p 参数另外指定一个新端口再开一个 sshd ，注意加上调试参数（具体是啥要查下，我忘了），然后客户端再连这个新的 sshd 。
再在服务端应该能看到详细的日志，里面肯定有报错信息，见招拆招吧

确认 ubuntu 和远端 mac 的.ssh 文件夹内容都是一样的？

另外 debug 信息要多点，多加点-v
ssh -vvvvvvv 这种

再仔细检查一下对端 authorized_keys 有没有漏输入什么的，我时常 vim 粘贴前忘了按下 i ，就会丢掉第一个 s ，贴进去的就是 sh-rsa xxxxx…

22.04 的 sshd 是 8.9 版本，而 8.8 以后不再禁用 RSA 算法了，换 ed25519 试试

第一步，生成密钥的时候使用 ssh-keygen -t ed25519 这个命令试试看，如果成功了，自己查吧。

目前已经尝试：
@xinge666 @PbCopy111 已经用 ed25519 重新生成，放到 vps(ubuntu 22.04)上，依旧成功免密登录，但放到 MacOs 上依然失败。同时结合了 @crab @dingwen07 的建议，已经添加到 keychain ，且 remote login 临时设置允许对象为 full ，仍然要求密钥。 @ETiV 用的 cp id_ed25519.pub .ssh/authorized_keys ，所以应该没有手工输入的错误，也谢谢建议。

服务器端和啰嗦模式，我都不熟悉怎么弄，再研究一下，谢谢大家！

看来是真的不懂😂
你直接 cp 会把原来的 keys 覆盖掉的，不知道你备份了没有…

应该 cat key.pub >> ~/.ssh/authorized_keys

ssh-copy-id 试试

@ETiV 你是指 authorized_keys 可以存放多 keys 是么？学习了，好在里面就这一个，以前没配置过。

@npe 这个试过了，也是一样结果，谢谢帮助。不过 ssh-copy-id 确实比手工方便。

是的，可以放多个。

你看下 ssh-add -L 会输出你现有的公钥不，这里边的公钥应该出现在远程电脑的 .ssh/authorized_keys 里

然后确认下使用 IP 访问行不行，而不要用 .local 的 hostname
再者，确认下用户名的大小写，Mac 的 GUI 上显示的名字是可以和 HOME 账号名不一样的，你应该用 `basename $HOME` 显示的名字去登

@ETiV 感谢帮助
ssh-add -L 显示 The agent has no identities.
在远程电脑里，用 vi 查看，可以看到公钥信息已经出现在 authorized_keys 中
ip 访问也是相同的结果，始终会要密码
用 basename $HOME 看了，用户名没问题

额外的调试：(不知道有没有用）
服务器端关闭 remote login(sharing)，然后 terminal 运行 /usr/ssh/sshd -d 看了 verbose output
显示：
hilary@hilary_s-mbp ~ % /usr/sbin/sshd -d
debug1: sshd version OpenSSH_8.6, LibreSSL 3.3.6
debug1: Unable to load host key: /etc/ssh/ssh_host_rsa_key
debug1: Unable to load host key: /etc/ssh/ssh_host_ecdsa_key
debug1: Unable to load host key: /etc/ssh/ssh_host_ed25519_key
sshd: no hostkeys available -- exiting.

情况比较复杂 😂

你自己客户端侧的 Mac 上执行一下：ssh-add -K $HOME/.ssh/id_XXX ，把私钥先都加进 keychain 里，再尝试 ssh 连上去。

如果还不行，你 ssh 的时候 用 -i ~/.ssh/id_XXX 指定一个私钥去连。。。

Mac 终端打开 vim .ssh/config
加上
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedKeyTypes +ssh-rsa
或者 ssh-keygen -t ecdsa -b 521 生成新的密钥对，ed25519 也可

Mac 要 add -k 我记得

你的 mac 电脑，没有开启 key 登录模式。。。。

@ETiV @tudou1514 谢谢帮助，试过了，都无效
我在 ssh -vvv 下，仔细看了过程，公钥 sent 正常，到私钥这步显示 debug2: we did not send a packet, disable method 。我按照网上资料，一般或者是因为权限，或者是因为 authorized_keys 内有错误，都检查了

@PbCopy111 求教 Mac 哪里查看是不是开启了 key 登录模式？

vi /etc/ssh/sshd_config

RSAAuthentication yes
PubkeyAuthentication yes

这个开了没有？
@youthfire #23

@PbCopy111 谢谢指导。我的理解是你指 remote 端 mac 这样改是吧，为防止出错，我两台 mac 都改了。已经 PubkeyAuthentication yes 。 没有添加 RSAAuthentication yes ，因为用的 ed25519 。然后 remote login off, remote login on （相当于重启了 hhd)，目前还是没效果。

tim@timmac ~ % ssh -Tvv [email protected]
OpenSSH_8.6p1, LibreSSL 3.3.6
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files
debug1: /etc/ssh/ssh_config line 54: Applying options for *
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to hilarymac.local port 22.
debug1: Connection established.
debug1: identity file /Users/tim/.ssh/id_rsa type -1
debug1: identity file /Users/tim/.ssh/id_rsa-cert type -1
debug1: identity file /Users/tim/.ssh/id_dsa type -1
debug1: identity file /Users/tim/.ssh/id_dsa-cert type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa_sk type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /Users/tim/.ssh/id_ed25519 type 3
debug1: identity file /Users/tim/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/tim/.ssh/id_ed25519_sk type -1
debug1: identity file /Users/tim/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /Users/tim/.ssh/id_xmss type -1
debug1: identity file /Users/tim/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.6
debug1: compat_banner: match: OpenSSH_8.6 pat OpenSSH* compat 0x04000000
debug1: Authenticating to hilarymac.local:22 as 'hilary'
debug1: load_hostkeys: fopen /Users/tim/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-ed25519 SHA256:xECOJFQQ3Rwk4Xg9QeD3yGZTE7ud71XhuBHGG/X0KPQ
debug1: load_hostkeys: fopen /Users/tim/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host 'hilarymac.local' is known and matches the ED25519 host key.
debug1: Found key in /Users/tim/.ssh/known_hosts:12
debug2: set_newkeys: mode 1
debug1: rekey out 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 in after 134217728 blocks
debug1: Will attempt key: /Users/tim/.ssh/id_rsa
debug1: Will attempt key: /Users/tim/.ssh/id_dsa
debug1: Will attempt key: /Users/tim/.ssh/id_ecdsa
debug1: Will attempt key: /Users/tim/.ssh/id_ecdsa_sk
debug1: Will attempt key: /Users/tim/.ssh/id_ed25519 ED25519 SHA256:wJbU+P+mASkQNm/g1cd+a8vRc/81sULbFgqzk7buPj8
debug1: Will attempt key: /Users/tim/.ssh/id_ed25519_sk
debug1: Will attempt key: /Users/tim/.ssh/id_xmss
debug2: pubkey_prepare: done
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,[email protected],ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected]>
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/tim/.ssh/id_rsa
debug1: Trying private key: /Users/tim/.ssh/id_dsa
debug1: Trying private key: /Users/tim/.ssh/id_ecdsa
debug1: Trying private key: /Users/tim/.ssh/id_ecdsa_sk
debug1: Offering public key: /Users/tim/.ssh/id_ed25519 ED25519 SHA256:wJbU+P+mASkQNm/g1cd+a8vRc/81sULbFgqzk7buPj8
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Trying private key: /Users/tim/.ssh/id_ed25519_sk
debug1: Trying private key: /Users/tim/.ssh/id_xmss
debug2: we did not send a packet, disable method
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug2: input_userauth_info_req: entering
debug2: input_userauth_info_req: num_prompts 1
([email protected]) Password:

还没解决呐 😂

先看 sshd 日志，再检查 key 权限

@ETiV 上面大家提到的，但凡认知范围内，能操作的都操作了，剩下的就是没有看服务器端日志，主要是我不清楚怎么看是正确的，又怕大家觉得我伸手党，搜了大半天，进展慢。

google 到的资料有说看 var/log/system.log ，我看了就 2 行，如下。似乎并没有什么帮助
Nov 25 23:42:10 hilary_s-mbp sshd: hilary [priv][7893]: USER_PROCESS: 7896 ttys000
Nov 25 23:42:14 hilary_s-mbp sshd: hilary [priv][7893]: DEAD_PROCESS: 7896 ttys000

也有说去 /etc/ssh/sshd_config 打开 LogLevel VERBOSE 。 我打开 sshd_config 并没有发现 LogLevel 字眼。是直接添加“LogLevel VERBOSE” 吗？然后去哪里看，system.log 吗？毫无概念

同时也有说，用 ssh -Tvv ，确实如 25 楼结果，显示了更详细的 debug2 。特意去查了“we did not send a packet, disable method”，如 23 楼时所示，无所收获

看了 2 天，基本把可能造成的十来种可能性都看了，又感觉都是 linux 解决方案，而我的 ubuntu remote 机上本身就很顺利。感觉 mac 作为 remote 是一个另类，当然主要还是我的知识有限。

服务端把 sshd 停掉

手动 /sbin/sshd -D 看日志

同样的问题，怎么改配置重启都不行，楼主最后解决了吗？

@Mmahaha 可能 mac 系统的问题，我有三台 mac 目标机，两台可以，一台不行。