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validate_nid.go
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/
validate_nid.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"
"regexp"
"strings"
engine "github.com/jptosso/coraza-waf"
"github.com/jptosso/coraza-waf/operators/nids"
)
type ValidateNid struct {
fn nids.Nid
rgx string
}
func (o *ValidateNid) Init(data string) error {
spl := strings.SplitN(data, " ", 2)
if len(spl) != 2 {
return fmt.Errorf("Invalid @validateNid argument")
}
o.fn = nids.NidMap()[spl[0]]
o.rgx = spl[1]
return nil
}
func (o *ValidateNid) Evaluate(tx *engine.Transaction, value string) bool {
re, _ := regexp.Compile(o.rgx)
matches := re.FindAllStringSubmatch(value, -1)
if tx.Capture {
tx.ResetCapture()
}
res := false
for i, m := range matches {
if i >= 10 {
break
}
//should we capture more than one NID?
if o.fn(m[0]) {
res = true
if tx.Capture {
tx.CaptureField(i, m[0])
}
}
}
return res
}