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Have I successfully blocked ssh logins to root? (lemmy.ml)
submitted 1 year ago by cyberwolfie@lemmy.ml to c/linux@lemmy.ml
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I have a server where I believe I have disabled root login via ssh. I think it is done correctly, as I cannot login with root myself via ssh, but I would've thought that it would be reflected in /var/log/auth.log. Instead, it shows up as failed password entry. Is this intended?

What I've done is to uncomment the PermitRootLogin no line in /etc/ssh/sshd_config. Rest of the config file is left at default.

Bonus question: All login attempts by ssh seems to go over some random port (even my own successful logins). Why is this?

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[-] cyberwolfie@lemmy.ml 2 points 1 year ago* (last edited 1 year ago)

Edit: oh, you’re talking about the high port OP is wondering about. That’s just the source port, which is chosen randomly by the client OS when making a connection. Using port 22 (or any other port below 1025) as a source port would require root privileges on the client and would also conflict with the SSH server that could be running there. Still, it has nothing to do with SSH “moving connections over”

Ah, I see, so the port numbers shown in auth.log are all client side ports. I guess I thought that the listening port would be in the log and assumed that the port listed there would be it, but when I read the lines again, it clearly says "from ip.ad.dr.ess port 12345"

this post was submitted on 10 Nov 2023
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