86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
/*
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* Copyright 2024 Jonas Kaninda
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package middleware
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import (
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"encoding/json"
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"fmt"
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"github.com/jkaninda/goma-gateway/pkg/logger"
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"net/http"
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"regexp"
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)
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// BlockExploitsMiddleware Middleware to block common exploits
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func BlockExploitsMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Patterns to detect SQL injection attempts
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sqlInjectionPattern := regexp.MustCompile(sqlPatterns)
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// Pattern to detect path traversal attempts
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pathTraversalPattern := regexp.MustCompile(traversalPatterns)
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// Pattern to detect simple XSS attempts
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xssPattern := regexp.MustCompile(xssPatterns)
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// Check query strings
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if sqlInjectionPattern.MatchString(r.URL.RawQuery) ||
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pathTraversalPattern.MatchString(r.URL.Path) ||
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xssPattern.MatchString(r.URL.RawQuery) {
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logger.Error("%s: %s Forbidden - Potential exploit detected", getRealIP(r), r.URL.Path)
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusForbidden)
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err := json.NewEncoder(w).Encode(ProxyResponseError{
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Success: false,
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Code: http.StatusForbidden,
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Message: fmt.Sprintf("Forbidden - Potential exploit detected"),
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})
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if err != nil {
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return
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}
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return
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}
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// Check form data (for POST requests)
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if r.Method == http.MethodPost {
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if err := r.ParseForm(); err == nil {
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for _, values := range r.Form {
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for _, value := range values {
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if sqlInjectionPattern.MatchString(value) || xssPattern.MatchString(value) {
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logger.Error("%s: %s Forbidden - Potential exploit detected", getRealIP(r), r.URL.Path)
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusForbidden)
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err := json.NewEncoder(w).Encode(ProxyResponseError{
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Success: false,
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Code: http.StatusForbidden,
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Message: fmt.Sprintf("Forbidden - Potential exploit detected"),
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})
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if err != nil {
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return
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}
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return
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}
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}
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}
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}
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}
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// Pass to the next handler if no exploit patterns were detected
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next.ServeHTTP(w, r)
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})
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}
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