diegospb
By:
diegospb

Cant SSH into my droplet after ssh key change

May 12, 2017 430 views
Logging DigitalOcean Ubuntu 16.04

I recently changed my ssh key and now i can't ssh back in.

Im able to log in with the console and i made sure to add it to the authorized_keys, i tried a power cycle but nothing.

here are the logs

➜  .ssh ssh -vvv root@ip
OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /Users/diego/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolving "ip" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to ip [ip] port 22.
debug1: Connection established.
debug1: identity file /Users/diego/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.1
debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to ip:22 as 'root'
debug3: hostkeys_foreach: reading file "/Users/diego/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /Users/diego/.ssh/known_hosts:5
debug3: load_hostkeys: loaded 1 keys from ip
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
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-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-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@libssh.org
debug1: kex: host key algorithm: rsa-sha2-512
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: Server host key: ssh-rsa SHA256:DQYDwlbtDbY7KnvYk1YXOTIuA2zEFN4YiVwbs0lKkJc
debug3: hostkeys_foreach: reading file "/Users/diego/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /Users/diego/.ssh/known_hosts:5
debug3: load_hostkeys: loaded 1 keys from ip
debug1: Host 'ip' is known and matches the RSA host key.
debug1: Found key in /Users/diego/.ssh/known_hosts:5
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: /Users/diego/.ssh/id_rsa (0x7fc5764023a0), agent
debug2: key: /Users/diego/.ssh/id_dsa (0x0)
debug2: key: /Users/diego/.ssh/id_ecdsa (0x0)
debug2: key: /Users/diego/.ssh/id_ed25519 (0x0)
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
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 RSA public key: /Users/diego/.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 60
debug1: Server accepts key: pkalg rsa-sha2-512 blen 535
debug2: input_userauth_pk_ok: fp SHA256:VIPr+b8oPeYuvYVCk5axHMcExuOdd7V/EmnQmekTgj4
debug3: sign_and_send_pubkey: RSA SHA256:VIPr+b8oPeYuvYVCk5axHMcExuOdd7V/EmnQmekTgj4
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug1: Trying private key: /Users/diego/.ssh/id_dsa
debug3: no such identity: /Users/diego/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /Users/diego/.ssh/id_ecdsa
debug3: no such identity: /Users/diego/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /Users/diego/.ssh/id_ed25519
debug3: no such identity: /Users/diego/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).
2 Answers
diegospb May 24, 2017
Accepted Answer

Solved it. FYI, it was a matter of changing

PermitRootLogin without-password in /etc/ssh/sshd_config

Hi!

EDIT: this is incorrect, the errors refer to the lines below them, not above!

It looks like OpenSSH is looking for your key but cannot find it:

debug1: identity file /Users/diego/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/diego/.ssh/id_ed25519-cert type -1

Where are you storing your private key? If it's not stored as one of the file names above, you will need to pass it manually:

ssh -i path_to_ssh_key user@host
  • I tried that, and even now that i can successfully ssh into the droplet, i get those debug messages.

    Thx!

    • Sorry, it turns out that the errors refer to the lines below them, not above. So, OpenSSH was actually looking for /Users/diego/.ssh/id_rsa-cert etc.

      It actually did find your key because it says:

      debug1: Offering RSA public key: /Users/diego/.ssh/id_rsa
      

      Are you able to successfully log in now that you've allowed root login in /etc/ssh/sshd_config?

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