C#實(shí)現(xiàn)過濾sql特殊字符的方法集合
更新時(shí)間：2015年11月13日 15:16:04 作者：寧靜.致遠(yuǎn)
這篇文章主要介紹了C#實(shí)現(xiàn)過濾sql特殊字符的方法,以實(shí)例形式分析總結(jié)了C#針對(duì)SQL危險(xiǎn)字符的幾種常用的過濾技巧,非常具有實(shí)用價(jià)值,需要的朋友可以參考下
本文實(shí)例講述了C#實(shí)現(xiàn)過濾sql特殊字符的方法集合。分享給大家供大家參考，具體如下：
1.
/// <summary>
/// 過濾不安全的字符串
/// </summary>
/// <param name="Str"></param>
/// <returns></returns>
public static string FilteSQLStr(string Str)
{
Str = Str.Replace("'", "");
Str = Str.Replace("\"", "");
Str = Str.Replace("&", "&");
Str = Str.Replace("<", "<");
Str = Str.Replace(">", ">");
Str = Str.Replace("delete", "");
Str = Str.Replace("update", "");
Str = Str.Replace("insert", "");
return Str;
}
2.
#region 過濾 Sql 語句字符串中的注入腳本
/// <summary>
/// 過濾 Sql 語句字符串中的注入腳本
/// </summary>
/// <param name="source">傳入的字符串</param>
/// <returns>過濾后的字符串</returns>
public static string SqlFilter(string source)
{
//單引號(hào)替換成兩個(gè)單引號(hào)
source = source.Replace("'", "''");
//半角封號(hào)替換為全角封號(hào)，防止多語句執(zhí)行
source = source.Replace(";", "；");
//半角括號(hào)替換為全角括號(hào)
source = source.Replace("(", "（");
source = source.Replace(")", "）");
///////////////要用正則表達(dá)式替換，防止字母大小寫得情況////////////////////
//去除執(zhí)行存儲(chǔ)過程的命令關(guān)鍵字
source = source.Replace("Exec", "");
source = source.Replace("Execute", "");
//去除系統(tǒng)存儲(chǔ)過程或擴(kuò)展存儲(chǔ)過程關(guān)鍵字
source = source.Replace("xp_", "x p_");
source = source.Replace("sp_", "s p_");
//防止16進(jìn)制注入
source = source.Replace("0x", "0 x");
return source;
}
#endregion
3.
/// 過濾SQL字符。
/// </summary>
/// <param name="str">要過濾SQL字符的字符串。</param>
/// <returns>已過濾掉SQL字符的字符串。</returns>
public static string ReplaceSQLChar(string str)
{
if (str == String.Empty)
return String.Empty; str = str.Replace("'", "‘");
str = str.Replace(";", "；");
str = str.Replace(",", ",");
str = str.Replace("?", "?");
str = str.Replace("<", "＜");
str = str.Replace(">", "＞");
str = str.Replace("(", "(");
str = str.Replace(")", ")");
str = str.Replace("@", "＠");
str = str.Replace("=", "＝");
str = str.Replace("+", "＋");
str = str.Replace("*", "＊");
str = str.Replace("&", "＆");
str = str.Replace("#", "＃");
str = str.Replace("%", "％");
str = str.Replace("$", "￥");
return str;
}
4.
/// <summary>
/// 過濾標(biāo)記
/// </summary>
/// <param name="NoHTML">包括HTML，腳本，數(shù)據(jù)庫關(guān)鍵字，特殊字符的源碼 </param>
/// <returns>已經(jīng)去除標(biāo)記后的文字</returns>
public string NoHtml(string Htmlstring)
{
if (Htmlstring == null)
{
return "";
}
else
{
//刪除腳本
Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
//刪除HTML
Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase);
//刪除與數(shù)據(jù)庫相關(guān)的詞
Htmlstring = Regex.Replace(Htmlstring, "select", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "insert", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "delete from", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "count''", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "drop table", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "truncate", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "asc", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "mid", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "char", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "exec master", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "net localgroup administrators", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "and", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "net user", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "or", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "net", "", RegexOptions.IgnoreCase);
//Htmlstring = Regex.Replace(Htmlstring, "*", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "-", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "delete", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "drop", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "script", "", RegexOptions.IgnoreCase);
//特殊的字符
Htmlstring = Htmlstring.Replace("<", "");
Htmlstring = Htmlstring.Replace(">", "");
Htmlstring = Htmlstring.Replace("*", "");
Htmlstring = Htmlstring.Replace("-", "");
Htmlstring = Htmlstring.Replace("?", "");
Htmlstring = Htmlstring.Replace("'", "''");
Htmlstring = Htmlstring.Replace(",", "");
Htmlstring = Htmlstring.Replace("/", "");
Htmlstring = Htmlstring.Replace(";", "");
Htmlstring = Htmlstring.Replace("*/", "");
Htmlstring = Htmlstring.Replace("\r\n", "");
Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
return Htmlstring;
}
}
5.
public static bool CheckBadWord(string str)
{
string pattern = @"select|insert|delete|from|count\(|drop table|update|truncate|asc\(|mid\(|char\(|xp_cmdshell|exec master|netlocalgroup administrators|net user|or|and";
if (Regex.IsMatch(str, pattern, RegexOptions.IgnoreCase))
return true;
return false;
}
public static string Filter(string str)
{
string[] pattern ={ "select", "insert", "delete", "from", "count\\(", "drop table", "update", "truncate", "asc\\(", "mid\\(", "char\\(", "xp_cmdshell", "exec master", "netlocalgroup administrators", "net user", "or", "and" };
for (int i = 0; i < pattern.Length; i++)
{
str = str.Replace(pattern[i].ToString(), "");
}
return str;
}
希望本文所述對(duì)大家C#程序設(shè)計(jì)有所幫助。
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