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- ⌘ ~ ❯ ssh -v -J gatekeeper@gateway ubuntu@node -i ~/.ssh/id_rsa
- OpenSSH_7.3p1, LibreSSL 2.4.1
- [...]
- debug1: Authentication succeeded (publickey).
- Authenticated to gateway ([35.156.248.245]:22).
- debug1: channel_connect_stdio_fwd node:22
- debug1: channel 0: new [stdio-forward]
- debug1: getpeername failed: Bad file descriptor
- debug1: Requesting no-more-sessions@openssh.com
- debug1: Entering interactive session.
- debug1: pledge: network
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- debug1: client_input_global_request: rtype keepalive@openssh.com want_reply 1
- channel 0: open failed: connect failed: Connection timed out
- stdio forwarding failed
- ssh_exchange_identification: Connection closed by remote host
- admin@gateway:~$ grep -e "[7669]" -e "[7739]" /var/log/auth.log
- Mar 13 11:01:20 gateway sshd[7669]: Set /proc/self/oom_score_adj to 0
- Mar 13 11:01:20 gateway sshd[7669]: rexec line 32: Deprecated option PermitBlacklistedKeys
- Mar 13 11:01:20 gateway sshd[7669]: Connection from <laptop-out-ip> port 62113 on <gateway-ip> port 22
- Mar 13 11:01:20 gateway sshd[7669]: Postponed publickey for gatekeeper from <laptop-out-ip> port 62113 ssh2 [preauth]
- Mar 13 11:01:20 gateway sshd[7669]: Accepted publickey for gatekeeper from <laptop-out-ip> port 62113 ssh2: RSA 8d:7e:9c:53:11:c9:4d:b3:67:7b:ae:04:03:8f:e2:71
- Mar 13 11:01:20 gateway sshd[7669]: pam_unix(sshd:session): session opened for user gatekeeper by (uid=0)
- Mar 13 11:01:20 gateway sshd[7669]: User child is on pid 7739
- Mar 13 11:03:27 gateway sshd[7739]: error: connect_to <node-ip> port 22: failed.
- Mar 13 11:03:28 gateway sshd[7739]: Connection closed by <laptop-out-ip>
- Mar 13 11:03:28 gateway sshd[7739]: Transferred: sent 2252, received 2864 bytes
- Mar 13 11:03:28 gateway sshd[7739]: Closing connection to <laptop-out-ip> port 62113
- Mar 13 11:03:28 gateway sshd[7669]: pam_unix(sshd:session): session closed for user gatekeeper
- # ssh service configuration
- AcceptEnv
- AddressFamily inet
- AllowAgentForwarding yes
- AllowGroups
- AllowTcpForwarding no
- AllowUsers gatekeeper
- AuthorizedKeysFile %h/.ssh/authorized_keys
- ChallengeResponseAuthentication no
- Ciphers aes128-ctr,aes192-ctr,aes256-ctr
- ClientAliveCountMax 3
- ClientAliveInterval 15
- Compression delayed
- DenyGroups
- DenyUsers
- GSSAPIAuthentication no
- GatewayPorts no
- HostKey /etc/ssh/ssh_host_dsa_key
- HostKey /etc/ssh/ssh_host_rsa_key
- HostKey /etc/ssh/ssh_host_ecdsa_key
- HostbasedAuthentication no
- KerberosAuthentication no
- ListenAddress 0.0.0.0:22
- LogLevel VERBOSE
- LoginGraceTime 60
- MaxAuthTries 6
- MaxSessions 10
- MaxStartups 30
- PasswordAuthentication no
- PermitBlacklistedKeys no
- PermitRootLogin no
- PermitTunnel no
- PermitUserEnvironment no
- PidFile /var/run/sshd.pid
- PrintLastLog yes
- PrintMotd no
- Protocol 2
- PubkeyAuthentication yes
- RSAAuthentication no
- RhostsRSAAuthentication no
- StrictModes yes
- SyslogFacility AUTH
- TCPKeepAlive yes
- UseDNS no
- UseLogin no
- UsePAM yes
- UsePrivilegeSeparation yes
- X11Forwarding no
- Match User gatekeeper
- AllowTcpForwarding yes
- AllowAgentForwarding no
- X11Forwarding no
- error: connect_to <node-ip> port 22: failed.
- ssh-keygen -t rsa
- ssh-copy-id -i .ssh/id_rsa.pub gatekeeper@gateway
- ssh-copy-id -i .ssh/id_rsa.pub ubuntu@node
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