72 lines
2.5 KiB
Go
72 lines
2.5 KiB
Go
/*
|
|
* Copyright 2024 Jonas Kaninda
|
|
*
|
|
* 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 middleware
|
|
|
|
import (
|
|
"fmt"
|
|
errorinterceptor "github.com/jkaninda/goma-gateway/pkg/errorinterceptor"
|
|
"github.com/jkaninda/goma-gateway/pkg/logger"
|
|
"net/http"
|
|
"regexp"
|
|
)
|
|
|
|
type BlockCommon struct {
|
|
ErrorInterceptor errorinterceptor.ErrorInterceptor
|
|
}
|
|
|
|
// BlockExploitsMiddleware Middleware to block common exploits
|
|
func (blockCommon BlockCommon) BlockExploitsMiddleware(next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
// Patterns to detect SQL injection attempts
|
|
sqlInjectionPattern := regexp.MustCompile(sqlPatterns)
|
|
|
|
// Pattern to detect path traversal attempts
|
|
pathTraversalPattern := regexp.MustCompile(traversalPatterns)
|
|
|
|
// Pattern to detect simple XSS attempts
|
|
xssPattern := regexp.MustCompile(xssPatterns)
|
|
|
|
// Check query strings
|
|
if sqlInjectionPattern.MatchString(r.URL.RawQuery) ||
|
|
pathTraversalPattern.MatchString(r.URL.Path) ||
|
|
xssPattern.MatchString(r.URL.RawQuery) {
|
|
logger.Error("%s: %s Forbidden - Potential exploit detected", getRealIP(r), r.URL.Path)
|
|
RespondWithError(w, http.StatusForbidden, fmt.Sprintf("%d Forbidden - Potential exploit detected", http.StatusForbidden), blockCommon.ErrorInterceptor)
|
|
return
|
|
|
|
}
|
|
// Check form data (for POST requests)
|
|
if r.Method == http.MethodPost {
|
|
if err := r.ParseForm(); err == nil {
|
|
for _, values := range r.Form {
|
|
for _, value := range values {
|
|
if sqlInjectionPattern.MatchString(value) || xssPattern.MatchString(value) {
|
|
logger.Error("%s: %s %s Forbidden - Potential exploit detected", getRealIP(r), r.Method, r.URL.Path)
|
|
RespondWithError(w, http.StatusForbidden, fmt.Sprintf("%d Forbidden - Potential exploit detected", http.StatusForbidden), blockCommon.ErrorInterceptor)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Pass to the next handler if no exploit patterns were detected
|
|
next.ServeHTTP(w, r)
|
|
})
|
|
}
|