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Trying to connect to a server. I've received a private key to login to that server which I added to id_rsa. However the client keeps attempting to pass that as the public key instead of id_rsa.pub. Is this because id_rsa.pub isn't in my ssh_config file?

SERVER CONNECTION ATTEMPT

debug1: Offering RSA public key: /root/.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

SSH CONFIG FILE (IDENTITY SECTION)

root@etoorlan4c:~/.ssh# cat /etc/ssh/ssh_config
#   StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa

CONTENTS OF ~/.ssh/

root@etoorlan4c:~/.ssh# ls
authorized_keys  id_rsa  id_rsa.pub  known_hosts

closed as off-topic by Jakuje, GAD3R, Anthon, Networker, Jeff Schaller Sep 26 '16 at 12:40

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions describing a problem that can't be reproduced and seemingly went away on its own (or went away when a typo was fixed) are off-topic as they are unlikely to help future readers." – Jakuje, GAD3R, Anthon, Networker, Jeff Schaller
If this question can be reworded to fit the rules in the help center, please edit the question.

  • 2
    Are you sure this is the private key ? ssh can compute public key from private. – Archemar Sep 26 '16 at 5:30
  • I copied and pasted it directly from the remote server. However running ssh-keygen -i returns uudecode failed. which the IBM site says means the key file is incorrect. I'm skeptical of the error because if I run ssh-keygen to make a new keypair, ssh-keygen -i still throws an error: Enter file in which the key is (/root/.ssh/id_rsa): decode blob failed: invalid format – Info5ek Sep 26 '16 at 5:38
  • From what (other than the potentially misleadingly named debug message) to you conclude your private key is offered? In particular, look for debug1: identity file further up in your connection log to see if ssh recognizes it. – Ulrich Schwarz Sep 26 '16 at 6:06
  • debug1: identity file /root/.ssh/id_rsa type 1 there's no mention anywhere in these connection logs of id_rsa.pub – Info5ek Sep 26 '16 at 6:09
  • 2
    Even though your problem was unrelated, I want to reiterate what @Archemar said. You can basically think of the public key as being embedded inside of the private key. Offering RSA public key: /root/.ssh/id_rsa means that it is offering the public key that it gets from your private key file. – cowlinator Apr 26 '18 at 23:26
5

The private key was invalid. A single character was missing from it. The output changes as follows when a valid private key is used:

debug1: Offering RSA public key: root@etoorlan4c
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,password
debug1: Trying private key: sshkey.private
debug3: sign_and_send_pubkey: RSA SHA256:jmMyCOppv3KKkRgiHI4s5h3I7LwyCgms8uSG06KClQ4
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to [remoteHost]([xxx.xxx.xxx.xxx]:22).

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