-
-
Notifications
You must be signed in to change notification settings - Fork 195
/
pm_from_file.go
69 lines (63 loc) · 1.68 KB
/
pm_from_file.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
// 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"
"strings"
"sync"
ahocorasick "github.com/jptosso/aho-corasick"
engine "github.com/jptosso/coraza-waf"
"github.com/jptosso/coraza-waf/utils"
)
type PmFromFile struct {
Data []string
trie *ahocorasick.Trie
mux *sync.RWMutex
}
func (o *PmFromFile) Init(data string) error {
o.Data = []string{}
o.mux = &sync.RWMutex{}
b, err := utils.OpenFile(data)
content := string(b)
if err != nil {
return fmt.Errorf("error reading path %s", data)
}
sp := strings.Split(string(content), "\n")
for _, l := range sp {
if len(l) == 0 {
continue
}
l = strings.ReplaceAll(l, "\r", "") //CLF
if l[0] != '#' {
o.Data = append(o.Data, strings.ToLower(l))
}
}
o.trie = ahocorasick.NewTrieBuilder().
AddStrings(o.Data).
Build()
return nil
}
func (o *PmFromFile) Evaluate(tx *engine.Transaction, value string) bool {
o.mux.RLock()
defer o.mux.RUnlock()
value = strings.ToLower(value)
matches := o.trie.MatchString(value)
for i := 0; i < len(matches); i++ {
if i == 10 {
return true
}
tx.CaptureField(i, string(matches[0].Match()))
}
return len(matches) > 0
}