无法更新git存储库："sign_and_send_pubkey: no mutual signature supported"

Question

我正在使用一个git存储库，并通过使用ssh密钥连接它。

一切都很顺利，直到今天。我执行pull操作时出现了以下ssh错误：

sign_and_send_pubkey: no mutual signature supported

然后它要求输入服务器上git用户的密码（我没有该密码）。

这很奇怪，因为以前它总是正常工作的。这是ssh的诊断日志输出：

$ GIT_SSH_COMMAND="ssh -vvvv" git pull origin Develop
OpenSSH_8.8p1, OpenSSL 1.1.1m  14 Dec 2021
debug1: Reading configuration data /c/Users/myuser/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolve_canonicalize: hostname SERVER.IP.ADDRESS is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/c/Users/myuser/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/c/Users/myuser/.ssh/known_hosts2'
debug3: ssh_connect_direct: entering
debug1: Connecting to SERVER.IP.ADDRESS [SERVER.IP.ADDRESS] port 22.
debug3: set_sock_tos: set socket 4 IP_TOS 0x48
debug1: Connection established.
debug1: identity file /c/Users/myuser/.ssh/id_rsa type -1
debug1: identity file /c/Users/myuser/.ssh/id_rsa-cert type -1
debug1: identity file /c/Users/myuser/.ssh/id_dsa type -1
debug1: identity file /c/Users/myuser/.ssh/id_dsa-cert type -1
debug1: identity file /c/Users/myuser/.ssh/id_ecdsa type -1
debug1: identity file /c/Users/myuser/.ssh/id_ecdsa-cert type -1
debug1: identity file /c/Users/myuser/.ssh/id_ecdsa_sk type -1
debug1: identity file /c/Users/myuser/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /c/Users/myuser/.ssh/id_ed25519 type -1
debug1: identity file /c/Users/myuser/.ssh/id_ed25519-cert type -1
debug1: identity file /c/Users/myuser/.ssh/id_ed25519_sk type -1
debug1: identity file /c/Users/myuser/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /c/Users/myuser/.ssh/id_xmss type -1
debug1: identity file /c/Users/myuser/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.8
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.4
debug1: compat_banner: match: OpenSSH_5.9p1 Debian-5ubuntu1.4 pat OpenSSH_5* compat 0x0c000002
debug2: fd 4 setting O_NONBLOCK
debug1: Authenticating to SERVER.IP.ADDRESS:22 as 'git'
debug3: record_hostkey: found key type ECDSA in file /c/Users/myuser/.ssh/known_hosts:1
debug3: load_hostkeys_file: loaded 1 keys from SERVER.IP.ADDRESS
debug1: load_hostkeys: fopen /c/Users/myuser/.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
debug3: order_hostkeyalgs: prefer hostkeyalgs: [e-mail],ecdsa-sha2-nistp256
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[e-mail],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: [e-mail],ecdsa-sha2-nistp256,[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],ssh-ed25519,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[e-mail],[e-mail],rsa-sha2-512,rsa-sha2-256
debug2: ciphers ctos: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail],aes128-cbc,3des-cbc,aes256-cbc,aes192-cbc
debug2: ciphers stoc: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail],aes128-cbc,3des-cbc,aes256-cbc,aes192-cbc
debug2: MACs ctos: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[e-mail],zlib
debug2: compression stoc: none,[e-mail],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-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: MACs ctos: hmac-md5,hmac-sha1,[e-mail],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: MACs stoc: hmac-md5,hmac-sha1,[e-mail],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: compression ctos: none,[e-mail]
debug2: compression stoc: none,[e-mail]
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: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: aes128-ctr MAC: [e-mail] compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: [e-mail] compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
debug3: record_hostkey: found key type ECDSA in file /c/Users/myuser/.ssh/known_hosts:1
debug3: load_hostkeys_file: loaded 1 keys from SERVER.IP.ADDRESS
debug1: load_hostkeys: fopen /c/Users/myuser/.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 'SERVER.IP.ADDRESS' is known and matches the ECDSA host key.
debug1: Found key in /c/Users/myuser/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 4294967296 blocks
debug1: Will attempt key: /c/Users/myuser/.ssh/id_rsa
debug1: Will attempt key: /c/Users/myuser/.ssh/id_dsa
debug1: Will attempt key: /c/Users/myuser/.ssh/id_ecdsa
debug1: Will attempt key: /c/Users/myuser/.ssh/id_ecdsa_sk
debug1: Will attempt key: /c/Users/myuser/.ssh/id_ed25519
debug1: Will attempt key: /c/Users/myuser/.ssh/id_ed25519_sk
debug1: Will attempt key: /c/Users/myuser/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /c/Users/myuser/.ssh/id_rsa
Enter passphrase for key '/c/Users/myuser/.ssh/id_rsa':
debug3: sign_and_send_pubkey: RSA SHA256:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
sign_and_send_pubkey: no mutual signature supported
debug1: Trying private key: /c/Users/myuser/.ssh/id_dsa
debug3: no such identity: /c/Users/myuser/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /c/Users/myuser/.ssh/id_ecdsa
debug3: no such identity: /c/Users/myuser/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /c/Users/myuser/.ssh/id_ecdsa_sk
debug3: no such identity: /c/Users/myuser/.ssh/id_ecdsa_sk: No such file or directory
debug1: Trying private key: /c/Users/myuser/.ssh/id_ed25519
debug3: no such identity: /c/Users/myuser/.ssh/id_ed25519: No such file or directory
debug1: Trying private key: /c/Users/myuser/.ssh/id_ed25519_sk
debug3: no such identity: /c/Users/myuser/.ssh/id_ed25519_sk: No such file or directory
debug1: Trying private key: /c/Users/myuser/.ssh/id_xmss
debug3: no such identity: /c/Users/myuser/.ssh/id_xmss: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[e-mail]'s password:

我做错了什么？

我正在使用Git for Windows（尝试过git bash和powershell控制台），版本为2.35.3.windows.1。

- Jepessen

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请参见https://confluence.atlassian.com/bitbucketserverkb/ssh-rsa-key-rejected-with-message-no-mutual-signature-algorithm-1026057701.html。 - torek

Answer 1

我在 OpenStack 中遇到了这个错误，对我来说解决办法是：

ssh -o 'PubkeyAcceptedKeyTypes +ssh-rsa' -i id_microstack cirros@10.20.20.15

- abdulsamed kayaduman

Answer 2

这个错误意味着服务器和客户端找不到双方都支持的算法。可能是因为服务器太旧，只支持已弃用的算法，而您的客户端不再接受这些算法。或者，您的客户端密钥使用了旧算法进行签名。

解决方案取决于具体情况：您可能需要升级服务器、客户端，或者使用更新的算法重新生成密钥。

但如果您想要重新启用旧算法，可以在您的~/.ssh/config文件中添加以下内容。（如果该文件不存在，请创建它）。

Host alias my-host.co
  PubkeyAcceptedKeyTypes=+ssh-rsa

注：

• 这些旧算法已被弃用，因为它们不再被认为是安全的。因此，这应该是您最后的解决方案。
• 我只为一个主机启用了旧算法，以降低风险。
• 我启用了ssh-rsa。 您可能需要其他一些算法，例如ssh-dss。

- Aidin

Answer 3

在文件~/.ssh/config中添加内容（nano ~/.ssh/config）

Host *
PubkeyAcceptedKeyTypes=+ssh-dss

- SergoUnix

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