using Microsoft.AspNetCore.Http;
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace CommonToolsCore
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{
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public class SqlFilter
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{
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/// <summary>
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/// 过滤不安全的字符串
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/// </summary>
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/// <param name="Str"></param>
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/// <returns></returns>
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public static string FilteSQLStr(string Str)
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{
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Str = Str.Replace("'", "");
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Str = Str.Replace("\"", "");
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Str = Str.Replace("&", "&");
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Str = Str.Replace("<", "<");
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Str = Str.Replace(">", ">");
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Str = Str.Replace("delete", "");
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Str = Str.Replace("update", "");
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Str = Str.Replace("insert", "");
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return Str;
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}
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#region 过滤 Sql 语句字符串中的注入脚本
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/// <summary>
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/// 过滤 Sql 语句字符串中的注入脚本
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/// </summary>
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/// <param name="source">传入的字符串</param>
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/// <returns>过滤后的字符串</returns>
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public static string SqlFilterFilter(string source)
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{
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//单引号替换成两个单引号
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source = source.Replace("'", "''");
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//半角封号替换为全角封号，防止多语句执行
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// source = source.Replace(";", "；");
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//半角括号替换为全角括号
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source = source.Replace("(", "（");
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source = source.Replace(")", "）");
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///////////////要用正则表达式替换，防止字母大小写得情况////////////////////
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//去除执行存储过程的命令关键字
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source = source.Replace("Exec", "");
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source = source.Replace("Execute", "");
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//去除系统存储过程或扩展存储过程关键字
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source = source.Replace("xp_", "x p_");
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source = source.Replace("sp_", "s p_");
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//防止16进制注入
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source = source.Replace("0x", "0 x");
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return source;
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}
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#endregion
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/// 过滤SQL字符。
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/// </summary>
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/// <param name="str">要过滤SQL字符的字符串。</param>
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/// <returns>已过滤掉SQL字符的字符串。</returns>
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public static string ReplaceSQLChar(string str)
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{
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if (str == String.Empty)
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return String.Empty; str = str.Replace("'", "‘");
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str = str.Replace(";", "；");
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str = str.Replace(",", ",");
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str = str.Replace("?", "?");
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str = str.Replace("<", "＜");
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str = str.Replace(">", "＞");
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str = str.Replace("(", "(");
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str = str.Replace(")", ")");
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str = str.Replace("@", "＠");
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str = str.Replace("=", "＝");
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str = str.Replace("+", "＋");
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str = str.Replace("*", "＊");
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str = str.Replace("&", "＆");
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str = str.Replace("#", "＃");
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str = str.Replace("%", "％");
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str = str.Replace("$", "￥");
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return str;
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}
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}
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}
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