fail2ban/config/action.d/cloudflare.conf

#
# Author: Mike Rushton
#
# IMPORTANT
#
# Please set jail.local's permission to 640 because it contains your CF API key.
#
# This action depends on curl (and optionally jq).
# Referenced from http://www.normyee.net/blog/2012/02/02/adding-cloudflare-support-to-fail2ban by NORM YEE
#
# To get your CloudFlare API Key: https://www.cloudflare.com/a/account/my-account
#
# CloudFlare API error codes: https://www.cloudflare.com/docs/host-api.html#s4.2

[Definition]

# Option:  actionstart
# Notes.:  command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
# Values:  CMD
#
actionstart =

# Option:  actionstop
# Notes.:  command executed at the stop of jail (or at the end of Fail2Ban)
# Values:  CMD
#
actionstop =

# Option:  actioncheck
# Notes.:  command executed once before each actionban command
# Values:  CMD
#
actioncheck =

# Option:  actionban
# Notes.:  command executed when banning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    <ip>  IP address
#          <failures>  number of failures
#          <time>  unix timestamp of the ban time
# Values:  CMD
#
# API v1
#actionban = curl -s -o /dev/null https://www.cloudflare.com/api_json.html -d 'a=ban' -d 'tkn=<cftoken>' -d 'email=<cfuser>' -d 'key=<ip>'
# API v4
actionban = curl -s -o /dev/null -X POST <_cf_api_prms> \
            -d '{"mode":"block","configuration":{"target":"ip","value":"<ip>"},"notes":"Fail2Ban <name>"}' \
            <_cf_api_url>

# Option:  actionunban
# Notes.:  command executed when unbanning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    <ip>  IP address
#          <failures>  number of failures
#          <time>  unix timestamp of the ban time
# Values:  CMD
#
# API v1
#actionunban = curl -s -o /dev/null https://www.cloudflare.com/api_json.html -d 'a=nul' -d 'tkn=<cftoken>' -d 'email=<cfuser>' -d 'key=<ip>'
# API v4
actionunban = id=$(curl -s -X GET <_cf_api_prms> \
                   "<_cf_api_url>?mode=block&configuration_target=ip&configuration_value=<ip>&page=1&per_page=1&notes=Fail2Ban%%20<name>" \
                   | { jq -r '.result[0].id' 2>/dev/null || tr -d '\n' | sed -nE 's/^.*"result"\s*:\s*\[\s*\{\s*"id"\s*:\s*"([^"]+)".*$/\1/p'; })
              if [ -z "$id" ]; then echo "<name>: id for <ip> cannot be found"; exit 0; fi;
              curl -s -o /dev/null -X DELETE <_cf_api_prms> "<_cf_api_url>/$id"

_cf_api_url = https://api.cloudflare.com/client/v4/user/firewall/access_rules/rules
_cf_api_prms = -H 'X-Auth-Email: <cfuser>' -H 'X-Auth-Key: <cftoken>' -H 'Content-Type: application/json'

[Init]

# If you like to use this action with mailing whois lines, you could use the composite action
# action_cf_mwl predefined in jail.conf, just define in your jail:
#
# action = %(action_cf_mwl)s
# # Your CF account e-mail
# cfemail  = 
# # Your CF API Key
# cfapikey = 

cftoken =

cfuser =