macOS Sierra (10.12.3) sshd pubkey

[Kes.Siebring]

Hello

I'm trying to setup sshd to use only key (no password).
But it doesn't seem to work, getting "Permission denied (publickey)." on Client & error 255 on Server.

on the Server my /etc/ssh/sshd_config has following options set :

PubkeyAuthentication yes
PasswordAuthentication no
ChallengeResponseAuthentication no

I've generated key pair (ssh-keygen -t rsa) & added pub to ~/.ssh/known_hosts on the Server

when I'm trying to connect from Client I get following :


host$ ssh -vT host@iMac.local -i /Users/host/.ssh/iMac
OpenSSH_7.3p1, LibreSSL 2.4.1
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: Connecting to imac.local [fe80::46a:da4b:6450:d98c%en0] port 22.
debug1: Connection established
debug1: identity file /Users/host/.ssh/iMac type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/host/.ssh/iMac-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.3
debug1: match: OpenSSH_7.3 pat OpenSSH* compat 0x04000000
debug1: Authenticating to imac.local:22 as 'host'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256@libssh.org
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
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
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:rxJDPZufTXwfc3nm3mChdsbDZtIyUuBR4A4ToHjRilQ
debug1: Host 'imac.local' is known and matches the ECDSA host key.
debug1: Found key in /Users/host/.ssh/known_hosts:24
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent]
debug1: expecting SSH2_MSG_NEWKEYS
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/host/.ssh/iMac
debug1: Authentications that can continue: publickey
debug1: No more authentication methods to try.
Permission denied (publickey).


Any help would be appreciated.

 

[belvdr]

You need to copy your public key from the client to ~/.ssh/authorized_keys on the server. Otherwise, the server daemon doesn't know anything about it.

Here's a good primer: https://kb.iu.edu/d/aews

 

[Kes.Siebring]

You need to copy your public key from the client to ~/.ssh/authorized_keys on the server. Otherwise, the server daemon doesn't know anything about it.

Here's a good primer: https://kb.iu.edu/d/aews

LOL 🙂
I can't believe I did something so stupid.... I was already typing a reply to you that I did added it to the "authorized_keys" and realised that I've being adding it to known_hosts :-(

Super ashamed, not the first time for me to setup the sshd & such an epic fail.

Thanks for the tip !

Next time I should really double check what I'm doing and, probably, not work at night 🙂