Installation

Requirements

Component	Minimum version	Source of truth
Go	1.25.1	go.mod — go 1.25.1, propagated from caddy/v2
Caddy	v2.11.x	go.mod — github.com/caddyserver/caddy/v2 v2.11.4
xcaddy	latest	github.com/caddyserver/xcaddy
MaxMind GeoLite2 Country MMDB	optional, only when using country block / whitelist	maxmind.com
MaxMind GeoLite2 ASN MMDB	optional, only when using block_asns	maxmind.com

Method 1 — Build with xcaddy (recommended)

go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest
xcaddy build --with github.com/fabriziosalmi/caddy-waf
./caddy list-modules | grep waf      # expect: http.handlers.waf

This produces a ./caddy binary in the current directory with the WAF compiled in.

Method 2 — Quick script

The repository ships install.sh, which performs an end-to-end setup: it ensures Go and xcaddy are present, clones (or pulls) the repository, downloads the GeoLite2 Country database, builds Caddy with the WAF, formats the bundled Caddyfile, and starts the server.

curl -fsSL -H "Pragma: no-cache" \
  https://raw.githubusercontent.com/fabriziosalmi/caddy-waf/refs/heads/main/install.sh | bash

The script targets Go 1.25.11 for new installs and refuses to proceed if a present Go installation is older than 1.25.0. Review the source before piping it into a shell.

A representative provisioning log:

INFO  Provisioning WAF middleware     {"log_level":"info","log_path":"debug.json","log_json":true,"anomaly_threshold":20}
INFO  http.handlers.waf  Tor exit nodes updated  {"count":1093}
INFO  WAF middleware version          {"version":"v0.3.10"}
INFO  Rate limit configuration        {"requests":100,"window":10,"cleanup_interval":300,"paths":["/api/v1/.*"],"match_all_paths":false}
WARN  GeoIP database not found. Country blacklisting/whitelisting will be disabled  {"path":"GeoLite2-Country.mmdb"}
INFO  IP blacklist loaded             {"path":"ip_blacklist.txt","valid_entries":223770,"invalid_entries":0,"total_lines":223770}
INFO  DNS blacklist loaded            {"path":"dns_blacklist.txt","valid_entries":854479,"total_lines":854479}
INFO  WAF rules loaded successfully   {"total_rules":33,"rule_counts":"Phase 1: 17 rules, Phase 2: 16 rules, Phase 3: 0 rules, Phase 4: 0 rules, "}
INFO  WAF middleware provisioned successfully

Method 3 — Build from source

git clone https://github.com/fabriziosalmi/caddy-waf.git
cd caddy-waf

go mod tidy
wget https://git.io/GeoLite2-Country.mmdb        # only if you intend to use GeoIP

xcaddy build --with github.com/fabriziosalmi/caddy-waf=./
./caddy fmt --overwrite
./caddy run

The =./ form of --with instructs xcaddy to use the local checkout rather than pulling from the module proxy; this is the right choice when developing or applying local patches.

Method 4 — caddy add-package

The module is registered in Caddy's package registry, so an existing Caddy v2.7+ binary can pull it in without a Go toolchain:

caddy add-package github.com/fabriziosalmi/caddy-waf

This asks the Caddy build service for a binary containing your current module set plus caddy-waf, then replaces the binary in place (backing up the old one unless --keep-backup is passed). Pin a version with @v0.3.10 if needed.

The module is also selectable on https://caddyserver.com/download.

See add-package-guide.md for the full flow, removal, and troubleshooting.

Method 5 — Docker

Images are published to GitHub Container Registry on every release tag, for linux/amd64 and linux/arm64. No Go toolchain, no build step:

docker run --rm -p 8080:8080 ghcr.io/fabriziosalmi/caddy-waf:0.3.10

Tag	Meaning
0.3.10	An exact release. Prefer this in deployments.
0.3	Latest patch of the 0.3 line.
latest	Latest release, whatever it currently is.

The image tag carries no v prefix, unlike the Go module version: @v0.3.10 for add-package, :0.3.10 for docker pull.

See docker.md for mounting rule files and blacklists, Docker Compose, and hot reload inside a container.

Verifying the build

./caddy list-modules | grep waf
# http.handlers.waf

./caddy version
# v2.11.x ...

Where to go next

Continue with configuration.md for every directive, or jump to the bundled Caddyfile for a working example.