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72 lines
2.4 KiB
Markdown
72 lines
2.4 KiB
Markdown
---
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title: 'Security | Fail2Ban'
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hide:
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- toc # Hide Table of Contents for this page
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---
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Fail2Ban is installed automatically and bans IP addresses for 3 hours after 3 failed attempts in 10 minutes by default.
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## Configuration files
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If you want to change this, you can easily edit [`config/fail2ban-jail.cf`][github-file-f2bjail].
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You can do the same with the values from `fail2ban.conf`, e.g `dbpurgeage`. In that case you need to edit [`config/fail2ban-fail2ban.cf`][github-file-f2bconfig].
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The configuration files need to be located at the root of the `/tmp/docker-mailserver/` volume bind.
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This following configuration files from `/tmp/docker-mailserver/` will be copied at boot time.
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- `fail2ban-jail.cf` -> `/etc/fail2ban/jail.d/user-jail.local`
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- `fail2ban-fail2ban.cf` -> `/etc/fail2ban/fail2ban.local`
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### Docker-compose config
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Example configuration volume bind:
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```yaml
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volumes:
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- ./config/:/tmp/docker-mailserver/
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```
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!!! attention
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The mail container must be launched with the `NET_ADMIN` capability in order to be able to install the iptable rules that actually ban IP addresses.
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Thus either include `--cap-add=NET_ADMIN` in the docker run commandline or the equivalent `docker-compose.yml`:
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```yaml
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cap_add:
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- NET_ADMIN
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```
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If you don't you will see errors the form of:
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```log
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iptables -w -X f2b-postfix -- stderr: "getsockopt failed strangely: Operation not permitted\niptables v1.4.21: can't initialize iptabl
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es table `filter': Permission denied (you must be root)\nPerhaps iptables or your kernel needs to be upgraded.\niptables v1.4.21: can'
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t initialize iptables table `filter': Permission denied (you must be root)\nPerhaps iptables or your kernel needs to be upgraded.\n"
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2016-06-01 00:53:51,284 fail2ban.action [678]: ERROR iptables -w -D INPUT -p tcp -m multiport --dports smtp,465,submission -
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j f2b-postfix
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```
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## Manage bans
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You can also manage and list the banned IPs with the [`setup.sh`][docs-setupsh] script.
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### List bans
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```sh
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./setup.sh debug fail2ban
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```
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### Un-ban
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Here `192.168.1.15` is our banned IP.
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```sh
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./setup.sh debug fail2ban unban 192.168.1.15
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```
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[docs-setupsh]: ../setup.sh.md
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[github-file-f2bjail]: https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-jail.cf
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[github-file-f2bconfig]: https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-fail2ban.cf
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