The systems are both CentOS 7 installations. I’m trying to configure key based SSH Authentication. This is what I get:
# ssh [email protected] -v
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to target.domain.com [10.0.5.40] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/user/.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_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug1: Authenticating to target.domain.com:22 as 'user'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
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
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:6h5hwXDIaE4rHPqZESx+bsoLFFMfowZB8vQ4pAaVG6o
debug1: Host 'target.domain.com' is known and matches the ECDSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
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,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/user/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/user/.ssh/id_dsa
debug1: Trying private key: /home/user/.ssh/id_ecdsa
debug1: Trying private key: /home/user/.ssh/id_ed25519
debug1: Next authentication method: password
[email protected]'s password:
Checking target.domain.com
:
# cat /home/user/.ssh/authorized_keys
ssh-rsa <correct-rsa-key> [email protected]
This was placed by doing:
ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
Which succeeded. The target’s logs:
# cat /var/log/messages | grep ssh
# journalctl _COMM=sshd > sshd_logs
# cat sshd_logs
Oct 01 08:39:06 target.domain.com sshd[32108]: Connection closed by 10.0.5.88 port 48274 [preauth]
Oct 01 08:47:33 target.domain.com sshd[32361]: Connection closed by 10.0.5.88 port 48424 [preauth]
Oct 01 08:52:21 target.domain.com sshd[40466]: Received signal 15; terminating.
Oct 01 08:52:21 target.domain.com sshd[32515]: Server listening on 10.0.5.73 port 22.
Oct 01 08:54:38 target.domain.com sshd[32575]: Connection closed by 10.0.5.88 port 48518 [preauth]
Note: Nothing is returned by cat /var/log/messages | grep ssh
.
I’m at a roadblock because nothing says why the key isn’t accepted or used. It’s offered, but authentication doesn’t happen? wat