Установка CrowdSec Firewall Bouncer на FreeBSD

[Itnull]

Packages installation​

Update the current package database and install the following packages. Make sure your systems is configured with a FreeBSD official repository either latest or quaterly

pkg -vvv|awk '/Repositories:/,/}/'
Repositories:
  FreeBSD: {
    url             : "pkg+http://pkg.FreeBSD.org/FreeBSD:12:amd64/latest",
    enabled         : yes,
...

You can edit the repository config file by editing /etc/pkg/FreeBSD.conf. By default, it should have been setup correctly during the OS installation.

sudo pkg update
sudo pkg install crowdsec crowdsec-firewall-bouncer

Firewall Configuration

• The FreeBSD firewall pf is not loaded by default, you need to load the kernel module:

sudo kldload pf

• Enable it in your /etc/rc.conf permanently:

pf_enable="YES"

In order to be able to block and drop traffic, you need to append this minimal /etc/pf.conf configuration in your pf rules:

# create crowdsec table
table <crowdsec-blacklists> persist

# create crowdsec6 table
table <crowdsec6-blacklists> persist

block drop in quick from <crowdsec-blacklists> to any
block drop in quick from <crowdsec6-blacklists> to any

For more details on the firewall configuration, you could refer to the pf.conf(5) man pages.

• Reload the rules and check config

sudo pfctl -f /etc/pf.conf
sudo pfctl -sr
sudo service pf check
sudo service pf status

Agent Configuration​

• Copy the sample config:

sudo cp /usr/local/etc/crowdsec/config.yaml.sample /usr/local/etc/crowdsec/config.yaml

Review the YAML settings in the file and updates accordingly.

• Enable it in your /etc/rc.conf:

crowdsec_enable="YES"
crowdsec_config="/usr/local/etc/crowdsec/config.yaml"
crowdsec_flags=" -info"

• Start the service Crowdsec Agent

sudo service crowdsec start
sudo service crowdsec status

• List your current machine Agent settings

crowdsec-cli machines list
-------------------------------------------------------------------------------------------------------------
NAME                                              IP ADDRESS  LAST UPDATE           STATUS  VERSION         
-------------------------------------------------------------------------------------------------------------
7fb0531dc09a40d288299c8377d6cfe5nJtGyC7TFsUR3XYZ  127.0.0.1   2021-07-22T09:41:47Z  ✔️       v1.1.1-freebsd
-------------------------------------------------------------------------------------------------------------

Bouncer Configuration​

• Copy the sample config

sudo cp /usr/local/etc/crowdsec-firewall-bouncer/crowdsec-firewall-bouncer.yaml.sample /usr/local/etc/crowdsec-firewall-bouncer/crowdsec-firewall-bouncer.yaml

• Add the new bouncer and it will generate the token for {your_api_key} to use

crowdsec-cli bouncers add --name freebsd-pf-bouncer

• Edit the YAML settings in the file. Make sure the bouncer backend mode is pf (automatically set at installation time). api_url and api_key are mandatory to be set.

api_url: http://localhost:8080/
api_key: <your_api_key>

• List your current bouncers config

$ crowdsec-cli bouncers list
---------------------------------------------------------------------------------------------------------
NAME                IP ADDRESS  VALID  LAST API PULL         TYPE                       VERSION         
---------------------------------------------------------------------------------------------------------
freebsd-pf-bouncer  127.0.0.1   ✔️      2021-07-22T09:59:33Z  crowdsec-firewall-bouncer  v0.0.13-freebsd
---------------------------------------------------------------------------------------------------------

• Enable it in your /etc/rc.conf:

crowdsec_firewall_enable="YES"

• Start the service Crowdsec Firewall

sudo service crowdsec_firewall start
sudo service crowdsec_firewall status

Scenarios, Parsers and Collections​

• Use the following scenarios, parsers and collections from the Hub:

sudo crowdsec-cli scenarios install crowdsecurity/ssh-bf
sudo crowdsec-cli parsers install crowdsecurity/sshd-logs
sudo crowdsec-cli parsers install crowdsecurity/syslog-logs
sudo crowdsec-cli collections install crowdsecurity/sshd

• Restart the crowdsec agent

sudo service crowdsec restart

You should now benefit from the Crowdsec signals from the community and your own and be protected against malevolant behaviour.