ubuntu-2204 gerrit/git ssh 报错Permission denied (publickey).分析及解决
使用repo init/sync下载代码时遇到报错: Permission denied (publickey).
分析排查步骤 通过以下步骤排查以下user及10.100.1.115为化名
$ ssh -p 29418 user@10.100.1.115
The authenticity of host '[10.100.1.115]:29418 ([10.100.1.115]:29418)' can't be established. ED25519 key fingerprint is SHA256:YmW8pF9ZuvIBcT6qWr5Q72zTP7RBVoGcovSKth6uFWo. This key is not known by any other names Are you sure you want to continue connecting (yes/no/[fingerprint])? yes Warning: Permanently added '[10.100.1.115]:29418' (ED25519) to the list of known hosts. user@10.100.1.115: Permission denied (publickey).
查看详细信息
$ ssh -vv -p 29418 user@10.100.1.115
OpenSSH_8.9p1 Ubuntu-3, OpenSSL 3.0.2 15 Mar 2022 debug1: Reading configuration data /home/user/.ssh/config debug1: /home/user/.ssh/config line 1: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files debug1: /etc/ssh/ssh_config line 21: Applying options for * debug2: resolve_canonicalize: hostname 10.100.1.115 is address debug1: Connecting to 10.100.1.115 [10.100.1.115] port 29418. debug1: Connection established. debug1: identity file /home/user/.ssh/id_rsa type 0 debug1: identity file /home/user/.ssh/id_rsa-cert type -1 debug1: identity file /home/user/.ssh/id_ecdsa type -1 debug1: identity file /home/user/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/user/.ssh/id_ecdsa_sk type -1 debug1: identity file /home/user/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /home/user/.ssh/id_ed25519 type -1 debug1: identity file /home/user/.ssh/id_ed25519-cert type -1 debug1: identity file /home/user/.ssh/id_ed25519_sk type -1 debug1: identity file /home/user/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /home/user/.ssh/id_xmss type -1 debug1: identity file /home/user/.ssh/id_xmss-cert type -1 debug1: identity file /home/user/.ssh/id_dsa type -1 debug1: identity file /home/user/.ssh/id_dsa-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_8.9p1 Ubuntu-3 debug1: Remote protocol version 2.0, remote software version GerritCodeReview_3.2.7 (APACHE-SSHD-2.4.0) debug1: compat_banner: no match: GerritCodeReview_3.2.7 (APACHE-SSHD-2.4.0) debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 10.100.1.115:29418 as 'user' debug1: load_hostkeys: fopen /home/user/.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,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,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 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,zlib@openssh.com,zlib debug2: compression stoc: none,zlib@openssh.com,zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group18-sha512,diffie-hellman-group17-sha512,diffie-hellman-group16-sha512,diffie-hellman-group15-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: host key algorithms: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc debug2: MACs ctos: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-md5,hmac-sha1-96,hmac-md5-96 debug2: MACs stoc: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-md5,hmac-sha1-96,hmac-md5-96 debug2: compression ctos: none debug2: compression stoc: none debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: ecdh-sha2-nistp256 debug1: kex: host key algorithm: ssh-ed25519 debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: SSH2_MSG_KEX_ECDH_REPLY received debug1: Server host key: ssh-ed25519 SHA256:YmW8pF9ZuvIBcT6qWr5Q72zTP7RBVoGcovSKth6uFWo debug1: load_hostkeys: fopen /home/user/.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 '[10.100.1.115]:29418' is known and matches the ED25519 host key. debug1: Found key in /home/user/.ssh/known_hosts:1 debug2: ssh_set_newkeys: mode 1 debug1: rekey out after 4294967296 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug2: ssh_set_newkeys: mode 0 debug1: rekey in after 4294967296 blocks debug1: get_agent_identities: bound agent to hostkey debug1: get_agent_identities: agent returned 1 keys debug1: Will attempt key: /home/user/.ssh/id_rsa RSA SHA256:bansqueqJ/in2VZCOhLH8qQbALzUhWiHySt3gePFYds agent debug1: Will attempt key: /home/user/.ssh/id_ecdsa debug1: Will attempt key: /home/user/.ssh/id_ecdsa_sk debug1: Will attempt key: /home/user/.ssh/id_ed25519 debug1: Will attempt key: /home/user/.ssh/id_ed25519_sk debug1: Will attempt key: /home/user/.ssh/id_xmss debug1: Will attempt key: /home/user/.ssh/id_dsa debug2: pubkey_prepare: done debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering public key: /home/user/.ssh/id_rsa RSA SHA256:bansqueqJ/in2VZCOhLH8qQbALzUhWiHySt3gePFYds agent debug1: send_pubkey_test: no mutual signature algorithm debug1: Trying private key: /home/user/.ssh/id_ecdsa debug1: Trying private key: /home/user/.ssh/id_ecdsa_sk debug1: Trying private key: /home/user/.ssh/id_ed25519 debug1: Trying private key: /home/user/.ssh/id_ed25519_sk debug1: Trying private key: /home/user/.ssh/id_xmss debug1: Trying private key: /home/user/.ssh/id_dsa debug2: we did not send a packet, disable method debug1: No more authentication methods to try. user@10.100.1.115: Permission denied (publickey).
通过以上详细信息可以看到以下几个关键点
- OpenSSH版本为 OpenSSH_8.9p1
- 失败的具体原因为
debug1: Next authentication method: publickey debug1: Offering public key: /home/user/.ssh/id_rsa RSA SHA256:bansqueqJ/in2VZCOhLH8qQbALzUhWiHySt3gePFYds agent debug1: send_pubkey_test: no mutual signature algorithm debug1: Trying private key: /home/user/.ssh/id_ecdsa debug1: Trying private key: /home/user/.ssh/id_ecdsa_sk debug1: Trying private key: /home/user/.ssh/id_ed25519 debug1: Trying private key: /home/user/.ssh/id_ed25519_sk debug1: Trying private key: /home/user/.ssh/id_xmss debug1: Trying private key: /home/user/.ssh/id_dsa debug2: we did not send a packet, disable method debug1: No more authentication methods to try. user@10.100.1.115: Permission denied (publickey).
- 验证publickey时，本地提供了私钥/home/user/.ssh/id_rsa，但是no mutual signature algorithm 无互签名算法，尝试ed25529等算法但是没有匹配的认证方式。
- 解决办法是提供ecdsa,ed25519,dsa等算法的公钥和私钥对。
OpenSSH 8.8 考虑到cryptographically broken,开始禁用了使用SHA-1哈希算法的RSA签名算法。
这是一个客户端限制。我们必须提供能被OpenSSH 8.8认可的密钥类型，比如 OpenSSH 推荐的Ed25519。
配置方法如下：
-
生成ed25519密钥
ssh-keygen -t ed25519 -C "your_email@example.com" -
将.ssh/id_ed25519.pub的文本添加到gerrit或git用户配置的SSH keys中
-
可以在$HOME/.ssh/config配置文件中指定认证选项，明确指定认证文件(不是必须的)
比如：
Host your.gerrit.host IdentityFile ~/.ssh/id_ed25519
- 或者在$HOME/.ssh/config配置文件中指定客户端接受RSA密钥（不推荐）
PubkeyAcceptedKeyTypes +ssh-rsa
