fix README.md

This commit is contained in:
John D. Robertson 2019-11-22 23:16:05 -05:00
parent a433b972c5
commit f7aa9b178a

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@ -14,24 +14,28 @@ minute on my rather modest Linode virtual server to have a chance of stopping
them. I hope you find this code useful.
##Configuration
*ban2fail* works from a configuration file found at
"/etc/ban2fail/ban2fail.cfg". The overarching premise is that if any REGEX
appearing in a LOGTYPE clause matches a line in an associated log file, then by
default that IP will be blocked.
>LOGTYPE auth {
> DIR= /var/log
> PREFIX= auth.log
>
> REGEX= imapd.*Login failed.*\[([0-9.]+)\]$
>
> REGEX= sshd.*Failed password.*from ([0-9.]+) port [0-9]+ ssh2$
>
> REGEX= Unable to negotiate with ([0-9.]+) port
>
> REGEX= in\.qpopper.*authentication failure.*tty=([0-9.]+)
>
>}
`
LOGTYPE auth {
DIR= /var/log
PREFIX= auth.log
REGEX= imapd.*Login failed.*\[([0-9.]+)\]$
REGEX= sshd.*Failed password.*from ([0-9.]+) port [0-9]+ ssh2$
REGEX= Unable to negotiate with ([0-9.]+) port
REGEX= in\.qpopper.*authentication failure.*tty=([0-9.]+)
}
`
Syntax in the config file is pretty much the same as the nftables syntax. All
keywords must be in upper case. Any values in the key-\>value pairs have
@ -43,31 +47,34 @@ clause. This clause allows you specify how many offenses are tolerated before an
IP is blocked. Offenses will naturally disappear as old logfiles are deleted by
*logrotate*.
># Take it easy on home boys
>MAX_OFFENSES 5 {
> COUNTRY= US
>}
>
># GeoIP doesn't know the location of every IP address
>MAX_OFFENSES 3 {
> COUNTRY= unknown
>}
>
># This is your whitelist: -1 means no limit.
>MAX_OFFENSES -1 {
>
># me from home
> IP= 205.144.171.37
>
># Some user
> IP= 173.236.196.36
>}
`
# Take it easy on home boys
MAX_OFFENSES 5 {
COUNTRY= US
}
# GeoIP doesn't know the location of every IP address
MAX_OFFENSES 3 {
COUNTRY= unknown
}
# This is your whitelist: -1 means no limit.
MAX_OFFENSES -1 {
# me from home
IP= 205.144.171.37
# Some user
IP= 173.236.196.36
}
`
If you recieve a complaint about an address unjustly getting blocked, place it
in one of the MAX\_OFFENSES blocks, and the IP will be unblocked the next time
*ban2fail* runs.
##Working with *ban2fail*
There are two primary modes in which *ban2fail* is used:
* Production mode, where iptables rules are modified.
@ -75,6 +82,7 @@ There are two primary modes in which *ban2fail* is used:
* Testing mode, where modifications to blocking rules are indicated.
###Production
In production mode it is expected that *ban2fail* is running from a cron job,
and no output is printed unless addresses are (un)blocked. It is also possible
to generate a listing of addresses, offense counts, and status with the -a
@ -82,11 +90,12 @@ command flag. Likewise, a listing of countries and offense counts is available
with the -c flag.
###Testing
In test mode (-t flags) the presumption is that you are testing a modified
configuration which is not yet in place, and that you don't want to disturb the
production setup. This is how you might do that:
>ban2fail -t myNew.cfg -a
`ban2fail -t myNew.cfg -a`
No iptables rules will be modified. You will shown in the listing which
addresses would be (un)blocked if *ban2fail* was running in production mode, and
@ -96,13 +105,15 @@ When you are happy with the new configuration, copy it into place, and the the
iptable rule changes will be realized the next time *ban2fail* runs.
##Building the Project
I've tested *ban2fail* on Debian Buster, but it should compile on just about any
modern Linux distro. It uses the GeoIP package to identify the country of origin
for IP addresses. Build and install like so:
>make release
>sudo make install
`
make release
sudo make install
`
The executable will be placed in "/usr/local/bin".