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using System;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Web;
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using ICSharpCode.SharpZipLib.Zip;
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// ReSharper disable once CheckNamespace
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namespace DSWeb.SoftMng.Common
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{
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public class Common
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{
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/// <summary>
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///SQL注入过滤
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/// </summary>
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/// <param name="source">要过滤的字符串</param>
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/// <returns>如果参数存在不安全字符，则返回true</returns>
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public static bool SqlFilterExist(string source)
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{
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string pattern = @"(select|insert|delete|from|count\(|drop table|update|truncate|asc\(|mid\(|char\(|xp_cmdshell|netlocalgroup administrators|net user|or|and|join|dec|exec|chr|declare)([\s+.*]|$)";
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if (Regex.IsMatch(source, pattern, RegexOptions.IgnoreCase))
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return true;
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return false;
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}
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/// <summary>
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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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/// <summary>
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/// 过滤标记
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/// </summary>
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/// <param name="htmlstring">包括HTML，脚本，数据库关键字，特殊字符的源码 </param>
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/// <returns>已经去除标记后的文字</returns>
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public static string SqlFilterNoHtml(string htmlstring)
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{
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//删除脚本
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htmlstring = Regex.Replace(htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
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//删除HTML
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htmlstring = Regex.Replace(htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"-->", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase);
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//删除与数据库相关的词
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htmlstring = Regex.Replace(htmlstring, "select", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "insert", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "delete from", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "count''", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "drop table", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "truncate", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "asc", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "mid", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "char", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "exec master", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "net localgroup administrators", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "and", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "net user", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "or", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "net", "", RegexOptions.IgnoreCase);
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//Htmlstring = Regex.Replace(Htmlstring, "*", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "-", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "delete", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "drop", "", RegexOptions.IgnoreCase);
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htmlstring = Regex.Replace(htmlstring, "script", "", RegexOptions.IgnoreCase);
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//特殊的字符
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htmlstring = htmlstring.Replace("<", "");
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htmlstring = htmlstring.Replace(">", "");
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htmlstring = htmlstring.Replace("*", "");
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htmlstring = htmlstring.Replace("-", "");
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htmlstring = htmlstring.Replace("?", "");
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htmlstring = htmlstring.Replace("'", "''");
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htmlstring = htmlstring.Replace(",", "");
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htmlstring = htmlstring.Replace("/", "");
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htmlstring = htmlstring.Replace(";", "");
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htmlstring = htmlstring.Replace("*/", "");
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htmlstring = htmlstring.Replace("\r\n", "");
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htmlstring = HttpContext.Current.Server.HtmlEncode(htmlstring).Trim();
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return htmlstring;
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}
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/// <summary>
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/// DES加密
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/// </summary>
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/// <param name="pToEncrypt">加密字符串</param>
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/// <param name="sKey">密钥</param>
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/// <returns></returns>
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public static string string_Encrypt(string pToEncrypt, string sKey)
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{
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if (pToEncrypt == "") return "";
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if (sKey.Length < 8) sKey = sKey + "xuE29xWp";
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if (sKey.Length > 8) sKey = sKey.Substring(0, 8);
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DESCryptoServiceProvider des = new DESCryptoServiceProvider();
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//把字符串放到byte数组中
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//原来使用的UTF8编码，我改成Unicode编码了，不行
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byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
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//建立加密对象的密钥和偏移量
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//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
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//使得输入密码必须输入英文文本
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des.Key = Encoding.Default.GetBytes(sKey);
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des.IV = Encoding.Default.GetBytes(sKey);
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MemoryStream ms = new MemoryStream();
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CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
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//Write the byte array into the crypto stream
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//(It will end up in the memory stream)
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cs.Write(inputByteArray, 0, inputByteArray.Length);
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cs.FlushFinalBlock();
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//Get the data back from the memory stream, and into a string
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StringBuilder ret = new StringBuilder();
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foreach (byte b in ms.ToArray())
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//Format as hex
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ret.AppendFormat("{0:X2}", b);
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return ret.ToString();
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}
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/// <summary>
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/// DES解密
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/// </summary>
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/// <param name="pToDecrypt">解密字符串</param>
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/// <param name="sKey">解密密钥</param>
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/// <returns></returns>
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public static string string_Decrypt(string pToDecrypt, string sKey)
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{
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if (pToDecrypt == "") return "";
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if (sKey.Length < 8) sKey = sKey + "xuE29xWp";
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if (sKey.Length > 8) sKey = sKey.Substring(0, 8);
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try
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{
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DESCryptoServiceProvider des = new DESCryptoServiceProvider();
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//Put the input string into the byte array
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byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
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for (int x = 0; x < pToDecrypt.Length / 2; x++)
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{
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int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
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inputByteArray[x] = (byte)i;
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}
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//建立加密对象的密钥和偏移量，此值重要，不能修改
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des.Key = Encoding.Default.GetBytes(sKey);
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des.IV = Encoding.Default.GetBytes(sKey);
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MemoryStream ms = new MemoryStream();
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CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
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//Flush the data through the crypto stream into the memory stream
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cs.Write(inputByteArray, 0, inputByteArray.Length);
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cs.FlushFinalBlock();
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//Get the decrypted data back from the memory stream
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//建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象
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StringBuilder ret = new StringBuilder();
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return System.Text.Encoding.Default.GetString(ms.ToArray());
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}
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catch
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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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} |