this post was submitted on 28 Nov 2023
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forwarding port 22 safe? (alien.top)
submitted 11 months ago by 1c34@alien.top to c/main@selfhosted.forum
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i want to remotely ssh to my home server, and I was wondering if I could just forward port 22 with disabling password login and use pubkey authentication will be safe enough?

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[–] blackstar2043@alien.top 1 points 11 months ago

This is my current hardened sshd configuration.

ssh/sshd_config: https://pastebin.com/7tH36TdJ

  • Public key authentication and 2fa using oathtool are used to authenticate.
  • Logging in is only possible for members of the 'ssh-user' group.
  • "root" login is disabled through "PermitRootLogin", "DenyGroups", and "DenyUsers".
  • "restricted" has the ability to log in from any host.
  • "user" is limited to using the internal network to log in.
  • 'admin' can only log in when connected via WireGuard.
  • "sftp" may login, but only uses the sftp server. There is no shell available.

pam.d/sshd: https://pastebin.com/eqkisf4F

  • All successful pre-2FA logins will trigger the 'ssh-login-alert', which sends an NTFY alert containing the time, date, user, and host IP.
  • The use of /etc/users.deny prevents root login.
  • The use of /etc/users.allowed permits login by "restricted", "user", "admin" and "sftp".
  • 2FA and ssh-login-alert trigger do not apply to "sftp"