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OWASP Coraza WAF : A Golang Modsecurity Compatible Web Application Firewall Library

OWASP Coraza Web Application Firewall, OWASP Coraza is a golang enterprise-grade Web Application Firewall framework that supports Modsecurity’s seclang language and is 100% compatible with OWASP Core Ruleset.

Prerequisites

Linux distribution (Debian and Centos are recommended, Windows is not supported yet)
Golang compiler v1.16+

Migrate from v1

Rollback SecAuditLog to the legacy syntax (serial/concurrent)
Attach an error log handler using waf.SetErrorLogCb(cb) (optional)
the function Transaction.Clean() must be used to clear transaction data, files and take them back to the sync pool.
If you are using low level APIs check the complete changelog as most of them were removed.
OWASP CRS does not require any external dependency anymore

Running the tests

Run the go tests:

go test ./…
go test -race ./…

Using pre-commit

pip install pre-commit
pre-commit run –all-files

ou can also install the pre-commit git hook by running

pre-commit install

Coraza v2 differences with v1

Full internal API refactor, public API has not changed
Full audit engine refactor with plugins support
New enhanced plugins interface for transformations, actions, body processors, and operators
We are fully compliant with Seclang from modsecurity v2
Many features removed and transformed into plugins: XML (Mostly), GeoIP and PCRE regex
Better debug logging
New error logging (like modsecurity)
Better performance

Your first Coraza WAF project

package main
import(
“fmt”
“github.com/corazawaf/coraza/v2”
“github.com/corazawaf/coraza/v2/seclang”
)
func main() {
// First we initialize our waf and our seclang parser
waf := coraza.NewWaf()
parser, _ := seclang.NewParser(waf)
// Now we parse our rules
if err := parser.FromString(SecRule REMOTE_ADDR "@rx .*" "id:1,phase:1,deny,status:403"); err != nil {
fmt.Println(err)
}
// Then we create a transaction and assign some variables
tx := waf.NewTransaction()
defer func(){
tx.ProcessLogging()
tx.Clean()
}()
tx.ProcessConnection(“127.0.0.1”, 8080, “127.0.0.1”, 12345)
// Finally we process the request headers phase, which may return an interruption
if it := tx.ProcessRequestHeaders(); it != nil {
fmt.Printf(“Transaction was interrupted with status %d\n”, it.Status)
}
}