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)
}
}