2f3d3ac20b
Following the merge of #16278 we need to update the fail2ban documentation to take account of the availability of the new sshConnectionFailed failed authentication attempt log message. Also add a deprecation notice regarding the previous publicKeyHandler messages, as these may be a source of false positives. Signed-off-by: Andrew Thornton <art27@cantab.net>
3.7 KiB
| date | title | slug | weight | toc | draft | menu | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018-05-11T11:00:00+02:00 | Usage: Setup fail2ban | fail2ban-setup | 16 | false | false |
|
Fail2ban setup to block users after failed login attempts
Remember that fail2ban is powerful and can cause lots of issues if you do it incorrectly, so make sure to test this before relying on it so you don't lock yourself out.
Gitea returns an HTTP 200 for bad logins in the web logs, but if you have logging options on in
app.ini, then you should be able to go off of log/gitea.log, which gives you something like this
on a bad authentication from the web or CLI using SSH or HTTP respectively:
2018/04/26 18:15:54 [I] Failed authentication attempt for user from xxx.xxx.xxx.xxx
2020/10/15 16:05:09 modules/ssh/ssh.go:143:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
(DEPRECATED: This may be a false positive as the user may still go on to correctly authenticate.)
2020/10/15 16:05:09 modules/ssh/ssh.go:155:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
(DEPRECATED: This may be a false positive as the user may still go on to correctly authenticate.)
2020/10/15 16:05:09 modules/ssh/ssh.go:198:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
(DEPRECATED: This may be a false positive as the user may still go on to correctly authenticate.)
2020/10/15 16:05:09 modules/ssh/ssh.go:213:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
(DEPRECATED: This may be a false positive as the user may still go on to correctly authenticate.)
2020/10/15 16:05:09 modules/ssh/ssh.go:227:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
(DEPRECATED: This may be a false positive as the user may still go on to correctly authenticate.)
2020/10/15 16:05:09 modules/ssh/ssh.go:249:sshConnectionFailed() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
(From 1.15 this new message will available and doesn't have any of the false positive results that above messages from publicKeyHandler do. This will only be logged if the user has completely failed authentication.)
2020/10/15 16:08:44 ...s/context/context.go:204:HandleText() [E] invalid credentials from xxx.xxx.xxx.xxx
Add our filter in /etc/fail2ban/filter.d/gitea.conf:
# gitea.conf
[Definition]
failregex = .*(Failed authentication attempt|invalid credentials|Attempted access of unknown user).* from <HOST>
ignoreregex =
Add our jail in /etc/fail2ban/jail.d/gitea.conf:
[gitea]
enabled = true
filter = gitea
logpath = /var/lib/gitea/log/gitea.log
maxretry = 10
findtime = 3600
bantime = 900
action = iptables-allports
If you're using Docker, you'll also need to add an additional jail to handle the FORWARD
chain in iptables. Configure it in /etc/fail2ban/jail.d/gitea-docker.conf:
[gitea-docker]
enabled = true
filter = gitea
logpath = /home/git/gitea/log/gitea.log
maxretry = 10
findtime = 3600
bantime = 900
action = iptables-allports[chain="FORWARD"]
Then simply run service fail2ban restart to apply your changes. You can check to see if
fail2ban has accepted your configuration using service fail2ban status.
Make sure and read up on fail2ban and configure it to your needs, this bans someone for 15 minutes (from all ports) when they fail authentication 10 times in an hour.
If you run Gitea behind a reverse proxy with Nginx (for example with Docker), you need to add this to your Nginx configuration so that IPs don't show up as 127.0.0.1:
proxy_set_header X-Real-IP $remote_addr;