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# SSH免密无法登录
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时间：2025年8月8日
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------
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记录一次SSH免密无法登录处理过程
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## 现象
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提交git仓代码时发现需要输入密码，检查git公钥私钥正常，怀疑gitea bug，删除gitea账户的密钥后，仍失败
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## 排查过程
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1、查看本机密钥权限是否存在异常
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```
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root@VM-2-16-ubuntu:~/.ssh# ll
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total 24
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drwx------ 2 root root 4096 Aug 7 23:56 ./
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drwx------ 25 root root 4096 Aug 7 23:51 ../
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-rw------- 1 root root 777 Dec 13 2024 authorized_keys
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-rw------- 1 root root 411 Nov 19 2024 id_ed25519
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###权限正常600 -> 411
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-rw-r--r-- 1 root root 101 Nov 19 2024 id_ed25519.pub
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-rw-r--r-- 1 root root 142 Aug 7 23:56 known_hosts
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```
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2、查看本机公钥私钥是否匹配
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```
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root@VM-2-16-ubuntu:~/.ssh# cat id_ed25519.pub
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ssh-ed25519 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA root@VM-2-16-ubuntu
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ssh-keygen -y -f ~/.ssh/id_ed25519
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ssh-ed25519 AAAAAAAAAAAAAAAAAAAAAAAAAA root@VM-2-16-ubuntu
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###密钥结果匹配，本机无异常
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```
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3、查看本机debug日志
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```
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root@VM-2-16-ubuntu:~/.ssh# ssh -vT -i ~/.ssh/id_ed25519 git@git.lzcwy.cn
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OpenSSH_9.6p1 Ubuntu-3ubuntu13.5, OpenSSL 3.0.13 30 Jan 2024
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debug1: Reading configuration data /etc/ssh/ssh_config
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debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
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debug1: /etc/ssh/ssh_config line 21: Applying options for *
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debug1: Connecting to git.lzcwy.cn [82.157.64.204] port 22.
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debug1: Connection established.
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debug1: identity file /root/.ssh/id_ed25519 type 3
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debug1: identity file /root/.ssh/id_ed25519-cert type -1
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debug1: Local version string SSH-2.0-OpenSSH_9.6p1 Ubuntu-3ubuntu13.5
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debug1: Remote protocol version 2.0, remote software version OpenSSH_9.6p1 Ubuntu-3ubuntu13.13
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debug1: compat_banner: match: OpenSSH_9.6p1 Ubuntu-3ubuntu13.13 pat OpenSSH* compat 0x04000000
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debug1: Authenticating to git.lzcwy.cn:22 as 'git'
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debug1: load_hostkeys: fopen /root/.ssh/known_hosts2: No such file or directory
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debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
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debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
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debug1: SSH2_MSG_KEXINIT sent
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debug1: SSH2_MSG_KEXINIT received
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debug1: kex: algorithm: sntrup761x25519-sha512@openssh.com
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debug1: kex: host key algorithm: ssh-ed25519
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debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
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debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
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debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
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debug1: SSH2_MSG_KEX_ECDH_REPLY received
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debug1: Server host key: ssh-ed25519 SHA256:KeQo88NlFRuNnUykhPUh2o0dyWazhH9OIvIPklUD4w4
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debug1: load_hostkeys: fopen /root/.ssh/known_hosts2: No such file or directory
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debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
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debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
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debug1: Host 'git.lzcwy.cn' is known and matches the ED25519 host key.
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debug1: Found key in /root/.ssh/known_hosts:1
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debug1: ssh_packet_send2_wrapped: resetting send seqnr 3
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debug1: rekey out after 134217728 blocks
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debug1: SSH2_MSG_NEWKEYS sent
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debug1: Sending SSH2_MSG_EXT_INFO
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debug1: expecting SSH2_MSG_NEWKEYS
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debug1: ssh_packet_read_poll2: resetting read seqnr 3
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debug1: SSH2_MSG_NEWKEYS received
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debug1: rekey in after 134217728 blocks
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debug1: SSH2_MSG_EXT_INFO received
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debug1: kex_ext_info_client_parse: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256>
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debug1: kex_ext_info_check_ver: publickey-hostbound@openssh.com=<0>
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debug1: kex_ext_info_check_ver: ping@openssh.com=<0>
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debug1: SSH2_MSG_SERVICE_ACCEPT received
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debug1: SSH2_MSG_EXT_INFO received
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debug1: kex_ext_info_client_parse: server-sig-algs=<ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256>
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debug1: Authentications that can continue: publickey,password
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debug1: Next authentication method: publickey
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debug1: Will attempt key: /root/.ssh/id_ed25519 ED25519 SHA256:w2mqdrO/ZGBBofMzBXHkEIyuoSudfgtF3rTr5Tlr6eE explicit
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debug1: Offering public key: /root/.ssh/id_ed25519 ED25519 SHA256:w2mqdrO/ZGBBofMzBXHkEIyuoSudfgtF3rTr5Tlr6eE explicit
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debug1: Authentications that can continue: publickey,password
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debug1: Next authentication method: password
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git@git.lzcwy.cn's password:
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###debug1: Offering public key: /root/.ssh/id_ed25519 ED25519 说明本机可以识别到密钥并正确发送，查看对端日志
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```
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4、查看对端ssh日志
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```
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root@VM-24-13-ubuntu:/home/ubuntu# tail -f /var/log/auth.log
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2025-08-07T23:50:16.251031+08:00 localhost sshd[553036]: User git not allowed because account is locked
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###账号被锁定了
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```
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5、查看账号状态
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```
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root@VM-24-13-ubuntu:/home/ubuntu# passwd -S git
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git L 2024-12-31 -1 -1 -1 -1
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###L为被Lock，解锁账号
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```
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6、解锁账号恢复
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```
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usermod -p 密码 git
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```
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