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- VitePress: custom theme (SF system fonts, glass nav, soft surfaces, pill buttons, light/dark code blocks, refined feature cards, platform showcase + stat strip). - Replace every emoji across docs and README with inline SVG icons. - Verify and fix doc accuracy against actual scripts: JSON schema (category+pattern only), env-var configuration for json2*/import_* scripts, owasp2json CLI surface. - Add public assets (logo.svg, favicon.svg, hero-shield.svg) and Shiki haproxy alias. - Workflows default to self-hosted runner-02 with a configurable fallback to GitHub runners via the RUNS_ON repo variable. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
145 lines
3.8 KiB
Markdown
145 lines
3.8 KiB
Markdown
# HAProxy Integration
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This guide explains how to plug the generated rules into HAProxy using **ACL** files.
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## Quick start
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1. Download `haproxy_waf.zip` from the [latest release](https://github.com/fabriziosalmi/patterns/releases/latest).
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2. Drop the ACL files into `/etc/haproxy/` (or any path you prefer).
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3. Reference them from a `frontend` block.
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4. Reload HAProxy.
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## Files in the archive
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| File | Purpose |
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|------|---------|
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| `waf.acl` | Pre-compiled regex patterns covering every OWASP CRS category |
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| `bots.acl` | Bad-bot User-Agent patterns |
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## Step 1 — Reference the ACL files
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The cleanest approach is to load the patterns from disk with `-f`:
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```haproxy
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frontend http-in
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bind *:80
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bind *:443 ssl crt /etc/haproxy/certs/
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acl waf_match path,url_dec -m reg -i -f /etc/haproxy/waf.acl
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acl waf_match_q query -m reg -i -f /etc/haproxy/waf.acl
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acl bad_bot hdr(User-Agent) -m reg -i -f /etc/haproxy/bots.acl
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http-request deny deny_status 403 if waf_match || waf_match_q || bad_bot
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default_backend servers
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```
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## Step 2 — Validate and reload
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```bash
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sudo haproxy -c -f /etc/haproxy/haproxy.cfg && sudo systemctl reload haproxy
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```
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## ACL primer
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HAProxy ACLs match against fetch samples (path, query, headers, …) using converters and matchers:
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```haproxy
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# Match path against a regex
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acl sqli_path path -m reg -i union.*select
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# Match a specific query parameter
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acl sqli_qid url_param(id) -m reg -i union.*select
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# Match a request header
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acl bad_ref hdr(Referer) -m reg -i malicious-site\.com
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# Combine with boolean operators
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http-request deny if sqli_path || sqli_qid
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```
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## A complete example
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```haproxy
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global
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log /dev/log local0
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maxconn 4096
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defaults
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mode http
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log global
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option httplog
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timeout connect 5s
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timeout client 50s
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timeout server 50s
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frontend http-in
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bind *:80
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# WAF
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acl waf_match path,url_dec -m reg -i -f /etc/haproxy/waf.acl
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acl waf_match_q query -m reg -i -f /etc/haproxy/waf.acl
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acl bad_bot hdr(User-Agent) -m reg -i -f /etc/haproxy/bots.acl
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# Block matching requests
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http-request deny deny_status 403 if waf_match || waf_match_q || bad_bot
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default_backend servers
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backend servers
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balance roundrobin
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server srv1 127.0.0.1:8080 check
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```
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## Customization
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### Custom error response
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Return a styled error body instead of the default empty 403:
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```haproxy
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http-request deny deny_status 403 \
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content-type "text/html; charset=utf-8" \
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string "<h1>Blocked by WAF</h1>" if waf_match
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```
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### Logging blocked requests
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```haproxy
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http-request set-var(txn.blocked) str(1) if waf_match
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http-request capture var(txn.blocked) len 1
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log-format "%ci:%cp [%t] %ft %b/%s %ST %B blocked=%[var(txn.blocked)] ua=%[capture.req.hdr(0)]"
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```
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### Per-path whitelist
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```haproxy
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acl is_webhook path_beg /api/webhook
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http-request deny deny_status 403 if waf_match !is_webhook
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```
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### Combine with rate limiting
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```haproxy
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stick-table type ip size 100k expire 30s store http_req_rate(10s)
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http-request track-sc0 src
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acl too_many sc_http_req_rate(0) gt 100
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http-request deny deny_status 429 if too_many
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```
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## Testing
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```bash
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curl -I "http://example.com/?id=1' UNION SELECT * FROM users--"
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curl -A "AhrefsBot" -I "http://example.com/"
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echo "show stat" | sudo socat stdio /var/run/haproxy.sock
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```
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## Troubleshooting
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- **ACL never matches** — run `haproxy -c -f haproxy.cfg` to validate the syntax. Use `-d` for debug output to watch ACL evaluation in real time.
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- **Performance impact** — complex regex over `path,url_dec` adds per-request cost. Benchmark with realistic traffic before enabling globally.
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- **Configuration too large** — the converter keeps `waf.acl` flat and grep-friendly. Split it across multiple files if you need to apply different rule subsets to different frontends.
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