管理系统增加XSS和SQL注入攻击防御

internal/waf/injectionutils/utils_xss.go

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+// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package injectionutils
+
+/*
+#cgo CFLAGS: -O2 -I./libinjection/src
+
+#include <libinjection.h>
+#include <stdlib.h>
+*/
+import "C"
+import (
+	"github.com/cespare/xxhash/v2"
+	"net/url"
+	"strconv"
+	"strings"
+	"unsafe"
+)
+
+const MaxCacheDataSize = 1 << 20
+
+func DetectXSSCache(input string, isStrict bool, cacheLife int) bool {
+	var l = len(input)
+
+	if l == 0 {
+		return false
+	}
+
+	if cacheLife <= 0 || l < 512 || l > MaxCacheDataSize {
+		return DetectXSS(input, isStrict)
+	}
+
+	var hash = xxhash.Sum64String(input)
+	var key = "WAF@XSS@" + strconv.FormatUint(hash, 10)
+	if isStrict {
+		key += "@1"
+	}
+
+	var result = DetectXSS(input, isStrict)
+	return result
+}
+
+// DetectXSS detect XSS in string
+func DetectXSS(input string, isStrict bool) bool {
+	if len(input) == 0 {
+		return false
+	}
+
+	if detectXSSOne(input, isStrict) {
+		return true
+	}
+
+	// 兼容 /PATH?URI
+	if (input[0] == '/' || strings.HasPrefix(input, "http://") || strings.HasPrefix(input, "https://")) && len(input) < 1024 {
+		var argsIndex = strings.Index(input, "?")
+		if argsIndex > 0 {
+			var args = input[argsIndex+1:]
+			unescapeArgs, err := url.QueryUnescape(args)
+			if err == nil && args != unescapeArgs {
+				return detectXSSOne(args, isStrict) || detectXSSOne(unescapeArgs, isStrict)
+			} else {
+				return detectXSSOne(args, isStrict)
+			}
+		}
+	} else {
+		unescapedInput, err := url.QueryUnescape(input)
+		if err == nil && input != unescapedInput {
+			return detectXSSOne(unescapedInput, isStrict)
+		}
+	}
+
+	return false
+}
+
+func detectXSSOne(input string, isStrict bool) bool {
+	if len(input) == 0 {
+		return false
+	}
+
+	var cInput = C.CString(input)
+	defer C.free(unsafe.Pointer(cInput))
+
+	var isStrictInt = 0
+	if isStrict {
+		isStrictInt = 1
+	}
+	return C.libinjection_xss(cInput, C.size_t(len(input)), C.int(isStrictInt)) == 1
+}