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First VPS — Is 54 SSH bans in 12 hours normal? (lemmy.ml)

submitted 1 month ago by tanka@lemmy.ml to c/selfhosted@lemmy.world

58 comments fedilink hide all child comments

So it's my first time setting up a VPS. Is it to be expected to ban 54 IPs over a 12h timespan? The real question for me is whether this is normal or too much.

$ sudo fail2ban-client status sshd
Status for the jail: sshd
|- Filter
|  |- Currently failed: 3
|  |- Total failed:     586
|  `- Journal matches:  _SYSTEMD_UNIT=ssh.service + _COMM=sshd
`- Actions
   |- Currently banned: 51
   |- Total banned:     54
   `- Banned IP list:   [list of IPs]

fail2ban sshd.conf

$ sudo cat /etc/fail2ban/jail.d/sshd.conf 
[sshd]
enabled = true
mode = aggressive
port = ssh
backend = systemd
maxretry = 3
findtime = 600
bantime = 86400

I have disabled SSH login via password. And only allow it over an SSH key.

$ sudo sshd -T | grep -E -i 'ChallengeResponseAuthentication|PasswordAuthentication|UsePAM|PermitRootLogin'
usepam no
permitrootlogin no
passwordauthentication no

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[–] nonentity@sh.itjust.works 5 points 1 month ago (1 children)

Rookie numbers.

My favourite f2b rule is the one strike ban on SSH root login attempts. Any IP originating a SSH root login attempt is clearly compromised, and gets black holed on all my hosts for a month.

Note: direct SSH login isn’t permitted at all, the daemon is exposed purely to log the attempts.

[–] irmadlad@lemmy.world 3 points 1 month ago (1 children)

a month.

I do it for a whole year. lol

[–] nonentity@sh.itjust.works 4 points 1 month ago (1 children)

The actual span is a random period between 2 and 4 weeks, it’s interesting to watch how long it takes for attempts to resume.

I prefer a more granular visibility, repeat offenders automagically ratchet up their stay in the sin bin.

[–] lka1988@lemmy.dbzer0.com 0 points 1 month ago

repeat offenders automagically ratchet up their stay in the sin bin.

Now that is a glorious read first thing in the morning haha