Who can help me solve the SSH authentication issue?

wajika · October 13, 2021, 10:58am

$ ssh -Tvvv git@gitlab.XX
OpenSSH_8.5p1, OpenSSL 1.1.1k  25 Mar 2021
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/c/Users/ABC/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/c/Users/ABC/.ssh/known_hosts2'
debug2: resolving "gitlab.XX" port 22
debug3: ssh_connect_direct: entering
debug1: Connecting to gitlab.XX [192.168.51.54] port 22.
debug3: set_sock_tos: set socket 3 IP_TOS 0x48
debug1: Connection established.
debug1: identity file /c/Users/ABC/.ssh/id_rsa type 0
debug1: identity file /c/Users/ABC/.ssh/id_rsa-cert type -1
debug1: identity file /c/Users/ABC/.ssh/id_dsa type -1
debug1: identity file /c/Users/ABC/.ssh/id_dsa-cert type -1
debug1: identity file /c/Users/ABC/.ssh/id_ecdsa type -1
debug1: identity file /c/Users/ABC/.ssh/id_ecdsa-cert type -1
debug1: identity file /c/Users/ABC/.ssh/id_ecdsa_sk type -1
debug1: identity file /c/Users/ABC/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /c/Users/ABC/.ssh/id_ed25519 type 3
debug1: identity file /c/Users/ABC/.ssh/id_ed25519-cert type -1
debug1: identity file /c/Users/ABC/.ssh/id_ed25519_sk type -1
debug1: identity file /c/Users/ABC/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /c/Users/ABC/.ssh/id_xmss type -1
debug1: identity file /c/Users/ABC/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.5
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.5
debug1: compat_banner: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.5 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to gitlab.XX:22 as 'git'
debug3: record_hostkey: found key type ED25519 in file /c/Users/ABC/.ssh/known_hosts:1
debug3: load_hostkeys_file: loaded 1 keys from gitlab.XX
debug1: load_hostkeys: fopen /c/Users/ABC/.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: have matching best-preference key type ssh-ed25519-cert-v01@openssh.com, using HostkeyAlgorithms verbatim
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,curve25519-sha256@libssh.org,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: 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-rsa-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,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,aes256-cbc,aes192-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,aes256-cbc,aes192-cbc
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: curve25519-sha256,curve25519-sha256@libssh.org,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,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
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
debug2: compression stoc: none,zlib@openssh.com
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: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> 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: ssh-ed25519 SHA256:na31/CugRLEiOgVNOf3mN15l3ZLqLgU/tzW1vggc1sQ
debug3: record_hostkey: found key type ED25519 in file /c/Users/ABC/.ssh/known_hosts:1
debug3: load_hostkeys_file: loaded 1 keys from gitlab.XX
debug1: load_hostkeys: fopen /c/Users/ABC/.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 'gitlab.XX' is known and matches the ED25519 host key.
debug1: Found key in /c/Users/ABC/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 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 134217728 blocks
debug1: Will attempt key: /c/Users/ABC/.ssh/id_ed25519 ED25519 SHA256:+LjmQS1ss7dITCFo06MpWbEGZk/xo2FMNA9xMqjuYEE agent
debug1: Will attempt key: /c/Users/ABC/.ssh/id_rsa RSA SHA256:N9aeOwUjI7YFU/HNjdf2dbb0zben/sWYpVeenoLZoL4
debug1: Will attempt key: /c/Users/ABC/.ssh/id_dsa
debug1: Will attempt key: /c/Users/ABC/.ssh/id_ecdsa
debug1: Will attempt key: /c/Users/ABC/.ssh/id_ecdsa_sk
debug1: Will attempt key: /c/Users/ABC/.ssh/id_ed25519_sk
debug1: Will attempt key: /c/Users/ABC/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
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: Offering public key: /c/Users/ABC/.ssh/id_ed25519 ED25519 SHA256:+LjmQS1ss7dITCFo06MpWbEGZk/xo2FMNA9xMqjuYEE agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug1: Offering public key: /c/Users/ABC/.ssh/id_rsa RSA SHA256:N9aeOwUjI7YFU/HNjdf2dbb0zben/sWYpVeenoLZoL4
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /c/Users/ABC/.ssh/id_dsa
debug3: no such identity: /c/Users/ABC/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /c/Users/ABC/.ssh/id_ecdsa
debug3: no such identity: /c/Users/ABC/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /c/Users/ABC/.ssh/id_ecdsa_sk
debug3: no such identity: /c/Users/ABC/.ssh/id_ecdsa_sk: No such file or directory
debug1: Trying private key: /c/Users/ABC/.ssh/id_ed25519_sk
debug3: no such identity: /c/Users/ABC/.ssh/id_ed25519_sk: No such file or directory
debug1: Trying private key: /c/Users/ABC/.ssh/id_xmss
debug3: no such identity: /c/Users/ABC/.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
git@gitlab.XX's password:

$ git push origin master
git@gitlab.XX's password:
Permission denied, please try again.
git@gitlab.XX's password:
Permission denied, please try again.
git@gitlab.XX's password:
git@gitlab.XX: Permission denied (publickey,password).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

I have added the public key to the gitlab page, but when verifying the authentication, I still need to enter a password. I am a little confused. Who can give me some ideas?

$ git remote -v
gitlab-hz       git@gitlab.XX/xxxx.git (fetch)
gitlab-hz       git@gitlab.XX/xxxx.git (push)
origin  git@gitlab.XX/xxxx.git (fetch)
origin  git@gitlab.XX/xxxx.git (push)

I have set the SSH repository address to origin, but when I execute git push again, it still prompts me that I need a password. I used public key password and gitlab user password respectively, and it doesn’t work. I’m wondering, what password is needed?

wajika · October 15, 2021, 2:43am

$ git config credential.helper store
$ git push https://gitlab.XX/owner/repo.git

Username for 'https://gitlab.XX': <USERNAME>       
Password for 'https://USERNAME@gitlab.XX': <PASSWORD>

I found a working method, which is to upload via http, but I still want to know why the SSH method does not work.

According to note_20478658 prompt, I checked the /var/log/auth.log log and found that there are a large number of “Failed password for invalid user git” records from my PC (192.168.4.228). What does this mean? Do I need to create a git user on the git server?

/var/log/auth.log snippet

Oct 15 02:05:01 hzssgitlab54 CRON[11955]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 15 02:05:01 hzssgitlab54 CRON[11955]: pam_unix(cron:session): session closed for user root
Oct 15 02:05:02 hzssgitlab54 sshd[11983]: Invalid user git from 192.168.4.228 port 6551
Oct 15 02:05:05 hzssgitlab54 sshd[11983]: pam_unix(sshd:auth): check pass; user unknown
Oct 15 02:05:05 hzssgitlab54 sshd[11983]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.4.228
Oct 15 02:05:07 hzssgitlab54 sshd[11983]: Failed password for invalid user git from 192.168.4.228 port 6551 ssh2
Oct 15 02:05:12 hzssgitlab54 sshd[11983]: pam_unix(sshd:auth): check pass; user unknown
Oct 15 02:05:15 hzssgitlab54 sshd[11983]: Failed password for invalid user git from 192.168.4.228 port 6551 ssh2
Oct 15 02:05:19 hzssgitlab54 sshd[11983]: pam_unix(sshd:auth): check pass; user unknown
Oct 15 02:05:21 hzssgitlab54 sshd[11983]: Failed password for invalid user git from 192.168.4.228 port 6551 ssh2
Oct 15 02:05:21 hzssgitlab54 sshd[11983]: Connection closed by invalid user git 192.168.4.228 port 6551 [preauth]
Oct 15 02:05:21 hzssgitlab54 sshd[11983]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.4.228
Oct 15 02:05:24 hzssgitlab54 sshd[12022]: Invalid user git from 192.168.4.228 port 12294
Oct 15 02:05:30 hzssgitlab54 sshd[12022]: pam_unix(sshd:auth): check pass; user unknown
Oct 15 02:05:30 hzssgitlab54 sshd[12022]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.4.228
Oct 15 02:05:32 hzssgitlab54 sshd[12022]: Failed password for invalid user git from 192.168.4.228 port 12294 ssh2
Oct 15 02:05:37 hzssgitlab54 sshd[12022]: pam_unix(sshd:auth): check pass; user unknown
Oct 15 02:05:40 hzssgitlab54 sshd[12022]: Failed password for invalid user git from 192.168.4.228 port 12294 ssh2
Oct 15 02:05:41 hzssgitlab54 sshd[12022]: Failed password for invalid user git from 192.168.4.228 port 12294 ssh2
Oct 15 02:05:41 hzssgitlab54 sshd[12022]: Connection closed by invalid user git 192.168.4.228 port 12294 [preauth]
Oct 15 02:05:41 hzssgitlab54 sshd[12022]: PAM 1 more authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.4.228

sudo passwd -d git

passwd: user ‘git’ does not exist

wajika · October 18, 2021, 3:09am

This issue has been resolved.
The cause of the problem is that if you use a non-SSH22 port, you need to add the gitlab_shell_ssh_port parameter.