init
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@@ -0,0 +1,182 @@
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package errorlog
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import (
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"strings"
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"unicode"
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)
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// sanitizeLogString 清理日志字符串,防止日志注入攻击
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// 移除或转义危险字符:
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// - 换行符 (\n, \r) - 可能用于伪造多行日志
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// - 制表符 (\t) - 可能用于格式化攻击
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// - 控制字符 - 可能用于隐藏攻击痕迹
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//
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// 参数:
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// - s: 要清理的字符串
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// - maxLength: 最大长度限制(0 表示不限制)
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//
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// 返回:
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// - 清理后的字符串
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func sanitizeLogString(s string, maxLength int) string {
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if s == "" {
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return s
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}
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// 移除控制字符和换行符
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var builder strings.Builder
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builder.Grow(len(s))
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for _, r := range s {
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// 允许打印字符和空格,移除控制字符
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if unicode.IsPrint(r) || r == ' ' {
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builder.WriteRune(r)
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} else {
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// 将控制字符替换为转义序列(可选,或直接移除)
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// 这里选择移除,因为转义序列也可能被利用
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}
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}
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result := builder.String()
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// 限制长度
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if maxLength > 0 && len(result) > maxLength {
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result = result[:maxLength] + "...[truncated]"
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}
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return result
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}
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// sanitizeLogLevel 验证和清理日志级别,防止伪造
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// 只允许预定义的日志级别
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func sanitizeLogLevel(level string) string {
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level = strings.ToLower(strings.TrimSpace(level))
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// 只允许预定义的级别
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allowedLevels := map[string]string{
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"error": "error",
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"warning": "warning",
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"warn": "warning", // 兼容 warn
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"info": "info",
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"debug": "debug",
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}
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if validLevel, ok := allowedLevels[level]; ok {
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return validLevel
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}
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// 如果级别无效,默认返回 error(最安全的级别)
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return "error"
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}
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// sanitizeLogArgs 清理日志参数,防止注入攻击
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// 将参数转换为安全的字符串表示
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func sanitizeLogArgs(args ...any) []any {
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if len(args) == 0 {
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return args
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}
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sanitized := make([]any, len(args))
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for i, arg := range args {
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switch v := arg.(type) {
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case string:
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// 字符串参数:清理控制字符
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sanitized[i] = sanitizeLogString(v, 0)
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case []byte:
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// 字节数组:转换为字符串后清理
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sanitized[i] = sanitizeLogString(string(v), 0)
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case error:
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// 错误对象:清理错误消息
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if v != nil {
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sanitized[i] = sanitizeLogString(v.Error(), 0)
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} else {
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sanitized[i] = "<nil>"
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}
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default:
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// 其他类型:保持原样(数字、布尔等通常是安全的)
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sanitized[i] = arg
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}
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}
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return sanitized
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}
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// sanitizeLogFormat 清理日志格式字符串,防止格式字符串注入
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// 移除危险的控制字符,但保留格式占位符(%v, %s 等)
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func sanitizeLogFormat(format string) string {
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if format == "" {
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return format
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}
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// 移除换行符和控制字符,但保留格式占位符
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var builder strings.Builder
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builder.Grow(len(format))
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for i := 0; i < len(format); i++ {
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r := rune(format[i])
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// 允许打印字符、空格和格式占位符
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if unicode.IsPrint(r) || r == ' ' {
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builder.WriteRune(r)
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} else if r == '\n' || r == '\r' || r == '\t' {
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// 将换行符和制表符替换为空格
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builder.WriteRune(' ')
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}
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// 其他控制字符直接移除
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}
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result := builder.String()
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// 限制格式字符串长度(防止过长的格式字符串攻击)
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maxFormatLength := 1000
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if len(result) > maxFormatLength {
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result = result[:maxFormatLength] + "...[truncated]"
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}
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return result
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}
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// sanitizeAttributes 清理 attributes map,防止注入攻击
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func sanitizeAttributes(attributes map[string]any) map[string]any {
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if attributes == nil || len(attributes) == 0 {
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return attributes
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}
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sanitized := make(map[string]any, len(attributes))
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for key, value := range attributes {
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// 清理 key
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sanitizedKey := sanitizeLogString(key, 100)
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// 清理 value
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switch v := value.(type) {
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case string:
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sanitized[sanitizedKey] = sanitizeLogString(v, 1000)
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case []byte:
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sanitized[sanitizedKey] = sanitizeLogString(string(v), 1000)
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case error:
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if v != nil {
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sanitized[sanitizedKey] = sanitizeLogString(v.Error(), 1000)
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} else {
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sanitized[sanitizedKey] = "<nil>"
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}
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case map[string]any:
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// 递归清理嵌套 map
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sanitized[sanitizedKey] = sanitizeAttributes(v)
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case []any:
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// 清理数组
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sanitizedArray := make([]any, len(v))
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for i, item := range v {
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if str, ok := item.(string); ok {
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sanitizedArray[i] = sanitizeLogString(str, 500)
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} else {
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sanitizedArray[i] = item
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}
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}
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sanitized[sanitizedKey] = sanitizedArray
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default:
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// 其他类型(数字、布尔等)保持原样
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sanitized[sanitizedKey] = value
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}
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}
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return sanitized
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}
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