No matter what I do, SSH permission is denied (public key)

pristine rock

Just when I thought I had a complete understanding of how SSH works, and what didn't, it randomly stopped working again. My permissions are perfect on both computers. One is a Debian machine and the other is a Windows machine using WSL

.ssh = 700 (drwx------)
id_rsa.pub = 644 (-rw-r--r--)
id_rsa (private) = 600 (-rw-------)
authorized_keys = 600 (-rw-------)

On both machines I uncommented and set PasswordAuthenticationit to noand I uncommented PubkeyAuthenticationit and set it toyes

I restarted ssh on both machines to make sure the settings were up to date. I even used debug level 3 to see what was going on. I've given both computers their respective public keys and saved them in a authorized_keysfile, but I'm still confused...

OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug2: resolving "deb99" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to deb99 [192.168.1.185] port 22.
debug1: Connection established.
debug1: identity file /home/ghost/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ghost/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.9p1 Debian-10+deb10u2
debug1: match: OpenSSH_7.9p1 Debian-10+deb10u2 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to deb99:22 as 'izuhu'
debug3: hostkeys_foreach: reading file "/home/ghost/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ghost/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from deb99
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: 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-group-exchange-sha1,diffie-hellman-group14-sha256,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],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],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: rsa-sha2-512,rsa-sha2-256,ssh-rsa,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: curve25519-sha256
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
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:hhqp/XWY6px3iVwD6X6+Zm8URnnS+Jbh+XUIrFFgzBc
debug3: hostkeys_foreach: reading file "/home/ghost/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ghost/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from deb99
debug3: hostkeys_foreach: reading file "/home/ghost/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/ghost/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 192.168.1.185
debug1: Host 'deb99' is known and matches the ECDSA host key.
debug1: Found key in /home/ghost/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey 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 after 134217728 blocks
debug2: key: /home/ghost/.ssh/id_rsa (0x7fffe2daf180)
debug2: key: /home/ghost/.ssh/id_dsa ((nil))
debug2: key: /home/ghost/.ssh/id_ecdsa ((nil))
debug2: key: /home/ghost/.ssh/id_ed25519 ((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 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:VSUBaSXtJL5FS4ljSDbvAOpCrfFyHKnujJZ4rXdtnMU /home/ghost/.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
debug1: Trying private key: /home/ghost/.ssh/id_dsa
debug3: no such identity: /home/ghost/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/ghost/.ssh/id_ecdsa
debug3: no such identity: /home/ghost/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/ghost/.ssh/id_ed25519
debug3: no such identity: /home/ghost/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
izuhu@deb99: Permission denied (publickey).

What exactly is the problem? Also, I wasn't sure if my debugging showed something that only did what I wanted, so I reset the ssh keys again lol

Jedev

Packet type 51 means "SSH_MSG_USERAUTH_FAILURE" and usually happens when the server doesn't recognize (or like/support) the public key provided by the client.

In this case, troubleshooting is best done by enabling debug logging on the server side, and looking at the server's debug log output to determine why it rejected the public key.

Frequently asked questions include:

  • The .pub file (or corresponding key) has not been properly configured on the SSH server for the user account you want to authenticate.

  • There is a .pub file (or corresponding key) on the server, but the permissions of the file it resides in are too open, and you need to fix the permissions of that server-side file before the server can try to use it for authentication.

You provided information about permissions, but it's not clear whether the permissions shown are for the .ssh directory on the SSH client machine or the .ssh folder on the SSH server machine (i.e. the .ssh folder in the home folder of the izuhu user account) .

Your next best option is to check the logging on the ssh server side to find out why it is rejecting the public key.

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