Block particular IP addresses on HAProxy load balancer using simple Access Control List.
HAProxy version.
$ haproxy -v HA-Proxy version 1.7.5-2 2017/05/17 Copyright 2000-2017 Willy Tarreau
Default HAProxy configuration.
global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin
stats timeout 30s
user haproxy
group haproxy
daemon
# Default SSL material locations
ca-base /etc/ssl/certs
crt-base /etc/ssl/private
# Default ciphers to use on SSL-enabled listening sockets.
# For more information, see ciphers(1SSL). This list is from:
# https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
# An alternative list with additional directives can be obtained from
# https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
ssl-default-bind-options no-sslv3
defaults
log global
mode http
option httplog
option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000
errorfile 400 /etc/haproxy/errors/400.http
errorfile 403 /etc/haproxy/errors/403.http
errorfile 408 /etc/haproxy/errors/408.http
errorfile 500 /etc/haproxy/errors/500.http
errorfile 502 /etc/haproxy/errors/502.http
errorfile 503 /etc/haproxy/errors/503.http
errorfile 504 /etc/haproxy/errors/504.http
Create ACL rule inside frontend section to define and block specific IP addresses.
acl is-blocked-ip src 192.0.2.11 192.0.2.12 192.0.2.18 http-request deny if is-blocked-ip
Sample frontend and backend using the created ACL rule.
frontend web
bind :80
#bind :443 ssl crt /etc/ssl/cert/
option httplog
log /dev/log local0 debug
option forwardfor except 127.0.0.1
option forwardfor header X-Real-IP
#redirect scheme https code 301 if !{ ssl_fc }
acl is-blocked-ip src 192.0.2.11 192.0.2.12 192.0.2.18
http-request deny if is-blocked-ip
acl is-draw hdr_dom(host) -i draw.example.org
use_backend web-draw-production if is-draw
backend web-draw-production
mode http
server draw 10.0.10.15:80
Alternatively, you can negate ACL rule to simply whitelist IP addresses.
acl is-whitelisted-ip src 192.0.2.11 192.0.2.12 192.0.2.18 http-request deny if !is-whitelisted-ip
Use a file to store IP addresses.
$ cat /etc/haproxy/whitelisted.ips 192.0.2.12 192.0.2.18
acl is-whitelisted-ip src -f /etc/haproxy/whitelisted.ips http-request deny if !is-whitelisted-ip
Compare IP addresses stored in a file to the the IP address defined in X-FORWARDED-FOR header.
acl is-whitelisted-ip hdr_ip(x-forwarded-for,-1) -f /etc/haproxy/whitelisted.ips http-request deny if !is-whitelisted-ip
deny action will stop the evaluation of the rules, immediately reject the request and return HTTP 403 error code. silent-drop will try to silently drop connection on the HAProxy, it won’t notify client, so any stateful devices placed between the client and HAProxy load balancer will keep connection established.