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rbl.go
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rbl.go
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// Copyright 2021 Juan Pablo Tosso
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package operators
import (
"fmt"
"net"
"time"
engine "github.com/jptosso/coraza-waf"
)
type Rbl struct {
service string
}
func (o *Rbl) Init(data string) error {
o.service = data
//TODO validate hostname
return nil
}
//https://github.com/mrichman/godnsbl
//https://github.com/SpiderLabs/ModSecurity/blob/b66224853b4e9d30e0a44d16b29d5ed3842a6b11/src/operators/rbl.cc
func (o *Rbl) Evaluate(tx *engine.Transaction, value string) bool {
//TODO validate address
c1 := make(chan bool)
//captures := []string{}
addr := fmt.Sprintf("%s.%s", value, o.service)
go func() {
res, err := net.LookupHost(addr)
if err != nil {
c1 <- false
}
//var status string
if len(res) > 0 {
txt, _ := net.LookupTXT(addr)
if len(txt) > 0 {
//status = txt[0]
//captures = append(captures, txt[0])
//tx.Collections["tx"].Data["httpbl_msg"] = []string{status}
}
}
c1 <- true
}()
select {
case res := <-c1:
if tx.Capture && res {
tx.ResetCapture()
//tx.AddCapture()
}
return res
case <-time.After(1):
// TIMEOUT
return false
}
return true
}