Echoing what samuel says. If you have non-local ip address from lot of different ranges, then port 22 from internet is being forwarded by something to this server.
I have a port 22 forwarded to a machine, and it does get almost continuous attempts (many an hour) trying various accounts. #1: disable root from logins like you have. #2: whatever account you could use to login should be something abnormal (ie not mike, john, or a common name or software product), as then the will be attempting against non-existent accounts and never get in. #3: whatever password you do have needs to be something good and something not compromised from one of your other accounts, it would be hard for them to even use a compromised password for you so long as they don't have a way to know this computer is yours and it gets even harder if the account in #2 is not something that you use on anyone else website that could be compromised and linked to the username. #4: install and configure fail2ban and it will block ip addresses after a few attempts, and whitelist anything on your own subnet you fully trust. On Thu, Jan 30, 2020 at 3:23 PM Samuel Sieb <sam...@sieb.net> wrote: > > On 1/30/20 1:12 PM, Michael Eager wrote: > > When I look at /var/log/secure or run journalctl on my workstation, I > > see failed SSH login attempts from a variety of IP addresses. The > > attempts are every 3-12 minutes. > > > > The workstation is on a LAN behind an EdgeRouter firewall. No Internet- > > accessible ports are forwarded to the workstation. The LAN has a > > variety of servers, NAS boxes, WiFi access points, WiFi-connected > > laptops, etc. > > > > A typical /var/log/secure entry looks like this: > > Jan 30 12:43:50 redwood sshd[21228]: Invalid user jackiehulu from > > 124.204.36.138 port 37394 > > Jan 30 12:43:51 redwood sshd[21228]: Received disconnect from > > 124.204.36.138 port 37394:11: Bye Bye [preauth] > > Jan 30 12:43:51 redwood sshd[21228]: Disconnected from invalid user > > jackiehulu 124.204.36.138 port 37394 [preauth] > > > > I'm assuming that something on the network has been compromised, > > allowing SSH login attempts on the LAN. Other than turning off > > each server/AP/laptop/etc, one at a time, to find when the accesses > > stop, is there any way to find out where the SSH attempt is coming from? > > From the attacking IP address, unless you're in China, your computer > must be internet accessible somehow. That's not an IP address on your > LAN, right? > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org
