# nono : say "no no" to intruders

Download nono.tgz:
=> nono.tgz

This is a tool to parse logs and ban ip when they have inappropriate behaviour.

First, you need to setup pf and create a table of banned ip:

```
block in quick on egress from <bot> to any
```

If you don't want to run nono as root (it's probably better), create a dedicated user:

```
# useradd -s /sbin/nologin -m -d /var/empty _nono
```

Then, setup doas so _nono don't need to enter its password:

```
permit nopass _nono cmd /sbin/pfctl
```

Once ready, you can pipe with ''tail -f'' any logs to nono:

```
tail -f /var/log/authlog /var/log/maillog | nono.awk
```

An example ''nono.sh'' is included. It can be started at boot in ''/etc/rc.local'' or edit root's crontab:

```
# crontab -e
@reboot /usr/local/bin/nono.sh
```

## Options

Set options with flags ''-v var=something''. Available options are:

* TRIES=5 : Maximum attemps an IP can do.
* BANCMD="doas -u _nono pfctl -T add -t bot" : command to ban an IP. Set to "echo" to just see what happens.
* KILLSTATE="doas -u _nono pfctl -k " : command to kill all states with an ip
* IGNORE=/etc/nono.ignore : file containing ignored IP, one per line.

## Expire

You may want to set a cron task to release IP after some time :

```
pfctl -t bot -T expire "$(( 60 * 60 * 24 * $EXPIRE_DAYS ))"
```

## Trivia

Previous attempt to build such tool was named vilain:
=> https://framagit.org/prx/vilain

Original idea by solene:
=> https://dataswamp.org/~solene/2023-06-22-opensmtpd-block-attempts.html