macOS Sierra (10.12.3) sshd pubkey

Discussion in 'Mac OS X Server, Xserve, and Networking' started by Kes.Siebring, Mar 1, 2017.

  1. Kes.Siebring macrumors newbie

    Kes.Siebring

    Joined:
    Feb 2, 2017
    Location:
    Planet E-arth
    #1
    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.
     
  2. belvdr macrumors 603

    Joined:
    Aug 15, 2005
    #2
    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
     
  3. Kes.Siebring thread starter macrumors newbie

    Kes.Siebring

    Joined:
    Feb 2, 2017
    Location:
    Planet E-arth
    #3
    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 :)
     

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