CODEWITHSUNDEEP
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Justin Schwimmer
Justin Schwimmer

Reputation: 185

Fedora / GitLab SSH Denied, Help Understanding Verbose Logs

My ssh connection to gitlab fails on my fedora 28 box, with no password request needed. This is preventing me from successfully running needed git commands. I've researched this thoroughly within SO and Googs, but nothing I found seems to work for my issue, more importantly, help explain the various sections of a 'vvv' log.

Set Up

Selinux = disabled

SSH directory: /home/justin/.ssh 

    drwx------   2 justin   root  4096 Nov 19 22:16  .ssh

Step 1) Create the keys: ssh-keygen -t rsa -b 4096 -C "[email protected]"

I accept the default location and then enter a pass phrase creating:

    -rw------- 1 justin root 3326 Nov 19 22:16 id_rsa

    -rw-r--r-- 1 justin root  749 Nov 19 22:16 id_rsa.pub

Step 2) Grab the contents of id_rsa.pub and add the key to Gitlabs SSH section, verifying that the entire public key is entered into Gitlabs form.

Step 3) Verify that the ssh-agent is running: eval "$(ssh-agent -s)"

Step 4) Add the private key: ssh-add /home/justin/.ssh/id_rsa

Step 5) Run my ssh command: ssh -vvvT [email protected] Confirming that the connection should create a known hosts file

Step 6) Cry after seeing: [email protected]: Permission denied (publickey)

The Verbose (vvv) Log

Loads config settings including those found in gitlab.conf:

OpenSSH_7.7p1, OpenSSL 1.1.0h-fips  27 Mar 2018
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: /etc/ssh/ssh_config line 52: Including file /etc/ssh/ssh_config.d/05-redhat.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/05-redhat.conf
debug3: /etc/ssh/ssh_config.d/05-redhat.conf line 2: Including file /etc/crypto-policies/back-ends/openssh.config depth 1
debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
debug3: gss kex names ok: [gss-gex-sha1-,gss-group14-sha1-]
debug3: kex names ok: [[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-group-exchange-sha1,diffie-hellman-group14-sha1]
debug1: /etc/ssh/ssh_config.d/05-redhat.conf line 8: Applying options for *
debug3: /etc/ssh/ssh_config line 52: Including file /etc/ssh/ssh_config.d/gitlab.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/gitlab.conf

Makes connection:

debug2: resolving "gitlab.domainname.net" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to gitlab.domainname.net [17.17.17.17] port 22.
debug1: Connection established.

Identity File Section...(Not sure what its doing?)

debug1: identity file /home/justin/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/justin/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/justin/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
            ...checking others
debug1: identity file /home/justin/.ssh/id_xmss-cert type -1

More logs that appear to be handshake related (I think?) / known_hosts setup:

debug1: Local version string SSH-2.0-OpenSSH_7.7
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.1
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to gitlab.domainname.net:22 as 'justin'
debug3: hostkeys_foreach: reading file "/home/justin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/justin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from gitlab.domainname.net
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
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: [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-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],[email protected],aes256-ctr,aes256-cbc,[email protected],aes128-ctr,aes128-cbc
debug2: ciphers stoc: [email protected],[email protected],aes256-ctr,aes256-cbc,[email protected],aes128-ctr,aes128-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha1,[email protected],hmac-sha2-512
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha1,[email protected],hmac-sha2-512
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,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,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: [email protected]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: [email protected] need=32 dh_need=32
debug1: kex: [email protected] need=32 dh_need=32
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31

Known host check:

debug1: Server host key: ecdsa-sha2-nistp256 SHA256:hyO5F3tsdf34PQGAYYhmoGW5J/leBnC0hj3IoE1F68
debug3: hostkeys_foreach: reading file "/home/justin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/justin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from gitlab.domainname.net
debug3: hostkeys_foreach: reading file "/home/justin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/justin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 17.17.17.17
debug1: Host 'gitlab.domainname.net' is known and matches the ECDSA host key.
debug1: Found key in /home/justin/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey 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

Final Auth Verfication:

debug1: rekey after 4294967296 blocks
debug2: key: /home/justin/.ssh/id_rsa (0x55d580f2caf0), agent
debug2: key: /home/justin/.ssh/id_dsa ((nil))
debug2: key: /home/justin/.ssh/id_ecdsa ((nil))
debug2: key: /home/justin/.ssh/id_ed25519 ((nil))
debug2: key: /home/justin/.ssh/id_xmss ((nil))
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
debug3: start over, passed a different list publickey
debug3: preferred gssapi-keyex,gssapi-with-mic,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: RSA SHA256:xbGUrKDgYhF34QYM1s20flfoVcjegZpbMwDDbpTmF1c /home/justin/.ssh/id_rsa
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51

(A) Is the auth section below responsible for the overall failure? (B) It seems to be trying to load every key type after successfully trying id_rsa, is that correct?

debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/justin/.ssh/id_dsa
debug3: no such identity: /home/justin/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/justin/.ssh/id_ecdsa
debug3: no such identity: /home/justin/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/justin/.ssh/id_ed25519
debug3: no such identity: /home/justin/.ssh/id_ed25519: No such file or directory
debug1: Trying private key: /home/justin/.ssh/id_xmss
debug3: no such identity: /home/justin/.ssh/id_xmss: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
[email protected]: Permission denied (publickey).

Failed Tests

More Questions

(C) debug1: identity file /home/justin/.ssh/id_rsa type 0: Line within the "Identity File Section", is this 0 value supposed to be 2? What does this value even mean, the number of key files it found per type?

(D) I'm unable to find an auth.log (or any logging for ssh) file within: /var/log/, why would that be or how can I fix this (Fedora 28)?

Thanks you for your time!

UPDATED: The Verbose (vvvv) Log

OpenSSH_7.7p1, OpenSSL 1.1.0h-fips  27 Mar 2018
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: /etc/ssh/ssh_config line 52: Including file /etc/ssh/ssh_config.d/05-redhat.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/05-redhat.conf
debug3: /etc/ssh/ssh_config.d/05-redhat.conf line 2: Including file /etc/crypto-policies/back-ends/openssh.config depth 1
debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
debug3: gss kex names ok: [gss-gex-sha1-,gss-group14-sha1-]
debug3: kex names ok: [[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-group-exchange-sha1,diffie-hellman-group14-sha1]
debug1: /etc/ssh/ssh_config.d/05-redhat.conf line 8: Applying options for *
debug3: /etc/ssh/ssh_config line 52: Including file /etc/ssh/ssh_config.d/gitlab.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/gitlab.conf
debug1: /etc/ssh/ssh_config.d/gitlab.conf line 2: Applying options for gitlab.domainname.net
debug2: resolving "gitlab.domainname.net" port 22
debug2: ssh_connect_direct: needpriv 0                                                                                                
debug1: Connecting to gitlab.domainname.net [17.17.17.17] port 22.                                                                     
debug1: Connection established.                                                                                                       
debug1: identity file /home/justin/.ssh/id_rsa type 0                                                                                 
debug1: key_load_public: No such file or directory                                                                                    
debug1: identity file /home/justin/.ssh/id_rsa-cert type -1                                                                           
debug1: Local version string SSH-2.0-OpenSSH_7.7                                                                                      
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.1                                          
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.1 pat OpenSSH* compat 0x04000000                                                         
debug2: fd 3 setting O_NONBLOCK                                                                                                       
debug1: Authenticating to gitlab.domainname.net:22 as 'justin'                                                                           
debug3: hostkeys_foreach: reading file "/home/justin/.ssh/known_hosts"                                                                
debug3: record_hostkey: found key type ECDSA in file /home/justin/.ssh/known_hosts:1                                                  
debug3: load_hostkeys: loaded 1 keys from gitlab.domainname.net                                                                          
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521                                       
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: [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-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],[email protected],aes256-ctr,aes256-cbc,[email protected],aes128-ctr,aes128-cbc
debug2: ciphers stoc: [email protected],[email protected],aes256-ctr,aes256-cbc,[email protected],aes128-ctr,aes128-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha1,[email protected],hmac-sha2-512
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha1,[email protected],hmac-sha2-512
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,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,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: [email protected]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: [email protected] need=32 dh_need=32
debug1: kex: [email protected] need=32 dh_need=32
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:hyO5F3t2OPc2nPQGAYYhmoGW5J/leBnC0hj3IoE1F68
debug3: hostkeys_foreach: reading file "/home/justin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/justin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from gitlab.domainname.net
debug3: hostkeys_foreach: reading file "/home/justin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/justin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 17.17.17.17
debug1: Host 'gitlab.domainname.net' is known and matches the ECDSA host key.
debug1: Found key in /home/justin/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey 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 after 4294967296 blocks
debug2: key: /home/justin/.ssh/id_rsa (0x55568d375a80), agent
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
debug3: start over, passed a different list publickey
debug3: preferred gssapi-keyex,gssapi-with-mic,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: RSA SHA256:xbGUrKDgYhF34QYM1s20flfoVcjegZpbMwDDbpTmF1c /home/justin/.ssh/id_rsa
debug3: send_pubkey_test
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
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
[email protected]: Permission denied (publickey).

Upvotes: 0

Views: 506

Answers (1)

Robbi Nespu
Robbi Nespu

Reputation: 320

your ssh folder and ssh key look good, just run ssh-add -l to see your identity, it nothing then run ssh-add it will configure keys itself since it installed on default .ssh directory and identify your identity

Use git username to ssh instead of your username on Gitlab instance. Change your config file into this

    User git
       Host gitlab.com gitlab.domainname.net
       IdentityFile ~/.ssh/id_rsa
       TCPKeepAlive yes
       IdentitiesOnly yes
       LogLevel VERBOSE

add your ssh key to https://gitlab.com/profile/keys and if you are self hosted find it on setting profile menu.

try to run ssh -vvvv [email protected] to see if it picks up the SSH key. (Do not use sudo)

That is proper step as show above. Below is your QA

A: You RSA key is are not succesfully read 

debug1: Next authentication method: publickey
debug1: Offering public key: RSA SHA256:xbGUrKDgYhF34QYM1s20flfoVcjegZpbMwDDbpTmF1c /home/justin/.ssh/id_rsa
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51

As I can see ssh client is not able to find separate public key debug1: identity file /home/justin/.ssh/id_rsa type 0 debug1: key_load_public: No such file or directory

B: but the RSA key does't work (last line). so it try to load other keys type but not are not exist, anyway we just need one working key.

debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/justin/.ssh/id_dsa
debug3: no such identity: /home/justin/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/justin/.ssh/id_ecdsa
debug3: no such identity: /home/justin/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/justin/.ssh/id_ed25519
debug3: no such identity: /home/justin/.ssh/id_ed25519: No such file or directory
debug1: Trying private key: /home/justin/.ssh/id_xmss
debug3: no such identity: /home/justin/.ssh/id_xmss: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.

Re-check your SELINUX status. Grep "denied" keyword from audit log. It no need to disable / change SELINUX, if blocked try to fix with restorecon -Rv ~/.ssh

Upvotes: 1

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