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Continuing on from #13953 continue to improve and standardise logging from internal SSH. Also updates the fail2ban setup Signed-off-by: Andrew Thornton <art27@cantab.net>
100 lines
2.9 KiB
Markdown
100 lines
2.9 KiB
Markdown
---
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date: "2018-05-11T11:00:00+02:00"
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title: "Usage: Setup fail2ban"
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slug: "fail2ban-setup"
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weight: 16
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toc: false
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draft: false
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menu:
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sidebar:
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parent: "usage"
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name: "Fail2ban setup"
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weight: 16
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identifier: "fail2ban-setup"
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---
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# Fail2ban setup to block users after failed login attempts
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**Remember that fail2ban is powerful and can cause lots of issues if you do it incorrectly, so make
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sure to test this before relying on it so you don't lock yourself out.**
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Gitea returns an HTTP 200 for bad logins in the web logs, but if you have logging options on in
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`app.ini`, then you should be able to go off of `log/gitea.log`, which gives you something like this
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on a bad authentication from the web or CLI using SSH or HTTP respectively:
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```log
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2018/04/26 18:15:54 [I] Failed authentication attempt for user from xxx.xxx.xxx.xxx
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```
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```log
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2020/10/15 16:05:09 modules/ssh/ssh.go:143:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
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```
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```log
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2020/10/15 16:05:09 modules/ssh/ssh.go:155:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
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```
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```log
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2020/10/15 16:05:09 modules/ssh/ssh.go:198:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
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```
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```log
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2020/10/15 16:05:09 modules/ssh/ssh.go:213:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
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```
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```log
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2020/10/15 16:05:09 modules/ssh/ssh.go:227:publicKeyHandler() [W] Failed authentication attempt from xxx.xxx.xxx.xxx
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```
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```log
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2020/10/15 16:08:44 ...s/context/context.go:204:HandleText() [E] invalid credentials from xxx.xxx.xxx.xxx
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```
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Add our filter in `/etc/fail2ban/filter.d/gitea.conf`:
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```ini
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# gitea.conf
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[Definition]
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failregex = .*(Failed authentication attempt|invalid credentials|Attempted access of unknown user).* from <HOST>
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ignoreregex =
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```
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Add our jail in `/etc/fail2ban/jail.d/gitea.conf`:
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```ini
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[gitea]
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enabled = true
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filter = gitea
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logpath = /var/lib/gitea/log/gitea.log
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maxretry = 10
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findtime = 3600
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bantime = 900
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action = iptables-allports
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```
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If you're using Docker, you'll also need to add an additional jail to handle the **FORWARD**
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chain in **iptables**. Configure it in `/etc/fail2ban/jail.d/gitea-docker.conf`:
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```ini
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[gitea-docker]
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enabled = true
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filter = gitea
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logpath = /home/git/gitea/log/gitea.log
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maxretry = 10
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findtime = 3600
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bantime = 900
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action = iptables-allports[chain="FORWARD"]
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```
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Then simply run `service fail2ban restart` to apply your changes. You can check to see if
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fail2ban has accepted your configuration using `service fail2ban status`.
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Make sure and read up on fail2ban and configure it to your needs, this bans someone
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for **15 minutes** (from all ports) when they fail authentication 10 times in an hour.
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If you run Gitea behind a reverse proxy with Nginx (for example with Docker), you need to add
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this to your Nginx configuration so that IPs don't show up as 127.0.0.1:
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```
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proxy_set_header X-Real-IP $remote_addr;
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```
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