1: /// summary>
2: ///SqlInject 的摘要說明
3: /// /summary>
4: public class SqlInject : System.Web.UI.Page
5: { 6: //檢測到注入后的處理方式: 0:僅警告；1：警告+記錄；2：警告+自定義錯誤頁面；3：警告+記錄+自定義錯誤頁面
7: private const int _type = 0;
8: private const string errRedirectPage = "/err.aspx";
9:
10: //如果記錄注入信息，那么請設置：errMDBpath：數據庫路徑
11: private const string errMDBpath = "/SqlInject.mdb";
12:
13:
14: //過濾特征字符
15: //過濾特征字符
16: private static string StrKeyWord = ConfigurationManager.AppSettings["SqlKeyWord"]; //@"select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec|master|net local group administrators|net user|or|and";
17: private static string StrRegex = ConfigurationManager.AppSettings["SqlRegex"]; //@";|/|(|)|[|]|{|}|%|@|*|'|!"; // 原始過濾條件：【-|;|,|/|(|)|[|]|{|}|%|@|*|'|!】 18:
19: private HttpRequest request;
20: public SqlInject(System.Web.HttpRequest _request)
21: { 22: this.request = _request;
23: }
24: ///summary>
25: ///檢測SQL注入及記錄、顯示出錯信息
26: ////summary>
27: public void CheckSqlInject()
28: { 29: bool isInject = false;
30: if (CheckRequestQuery() || CheckRequestForm())
31: { 32: isInject = true;
33: }
34: else
35: { 36: return;
37: }
38:
39: switch (_type)
40: { 41: case 0:
42: ShowErr();
43: break;
44: case 1:
45: ShowErr();
46: SaveToMdb();
47: break;
48: case 2:
49: ShowErr();
50: string temp;
51: System.Web.HttpContext.Current.Response.Write("script>setTimeout(\"" + "location.href='" + errRedirectPage + "'" + "\",5000)/script>"); 52: break;
53: case 3:
54: ShowErr();
55: SaveToMdb();
56: System.Web.HttpContext.Current.Response.Write("script>setTimeout(\"" + "location.href='" + errRedirectPage + "'" + "\",5000)/script>"); 57: break;
58: default:
59: break;
60: }
61: System.Web.HttpContext.Current.Response.End();
62:
63: }
64: private void SaveToMdb()
65: { 66: OleDbConnection conn = new OleDbConnection("Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + Server.MapPath(errMDBpath)); 67: conn.Open();
68: OleDbCommand cmd = conn.CreateCommand();
69:
70: cmd.CommandText = "insert into [Record] (sIP,sDate,sPath) values ('" + 71: request.ServerVariables["REMOTE_ADDR"].ToString() + "','" +
72: DateTime.Now + "','" + request.ServerVariables["URL"].ToLower() + RelaceSingleQuotes(request.QueryString.ToString()) + "')";
73: int code = cmd.ExecuteNonQuery();
74: if (code == 1)
75: System.Web.HttpContext.Current.Response.Write("br>****以上信息已記錄至日志數據庫****"); 76: else
77: System.Web.HttpContext.Current.Response.Write("br>日志數據庫出錯"); 78: conn.Close();
79:
80: }
81: private string RelaceSingleQuotes(string _url)
82: { 83: string URL = _url.Replace("'", "單引號"); 84: return URL;
85: }
86: private void ShowErr()
87: { 88: //string msg = @"font color=red>請不要嘗試未授權之入侵檢測！/font>" + @"br>br>";
89: //msg += @"操作IP：" + request.ServerVariables["REMOTE_ADDR"] + @"br>";
90: //msg += @"操作時間：" + DateTime.Now + @"br>";
91: //msg += @"頁面：" + request.ServerVariables["URL"].ToLower() + request.QueryString.ToString() + @"br>";
92: //msg += @"a href='#' onclick='javascript:window.close()'>關閉/a>";
93: //System.Web.HttpContext.Current.Response.Clear();
94: //System.Web.HttpContext.Current.Response.Write(msg);
95: System.Web.HttpContext.Current.Response.Write("script>alert('請不要嘗試未授權之入侵檢測！');javascript:history.go(-1);/script>"); 96: }
97: ///summary>
98: /// 特征字符
99: ////summary>
100: public static string KeyWord
101: { 102: get
103: { 104: return StrKeyWord;
105: }
106: }
107: ///summary>
108: /// 特征符號
109: ////summary>
110: public static string RegexString
111: { 112: get
113: { 114: return StrRegex;
115: }
116: }
117:
118: ///summary>
119: ///檢查字符串中是否包含Sql注入關鍵字
120: /// param name="_key">被檢查的字符串/param>
121: /// returns>如果包含注入true;否則返回false/returns>
122: ////summary>
123: private static bool CheckKeyWord(string _key)
124: { 125: string[] pattenString = StrKeyWord.Split('|'); 126: string[] pattenRegex = StrRegex.Split('|'); 127: foreach (string sqlParam in pattenString)
128: { 129: if (_key.Contains(sqlParam + " ") || _key.Contains(" " + sqlParam)) 130: { 131: return true;
132: }
133: }
134: foreach (string sqlParam in pattenRegex)
135: { 136: if (_key.Contains(sqlParam))
137: { 138: return true;
139: }
140: }
141: return false;
142:
143: }
144: ///summary>
145: ///檢查URL中是否包含Sql注入
146: /// param name="_request">當前HttpRequest對象/param>
147: /// returns>如果包含注入true;否則返回false/returns>
148: ////summary>
149: public bool CheckRequestQuery()
150: { 151: if (request.QueryString.Count > 0)
152: { 153: foreach (string sqlParam in this.request.QueryString)
154: { 155: if (sqlParam == "__VIEWSTATE") continue;
156: if (sqlParam == "__EVENTVALIDATION") continue;
157: if (CheckKeyWord(request.QueryString[sqlParam].ToLower()))
158: { 159: return true;
160: }
161: }
162: }
163: return false;
164: }
165: ///summary>
166: ///檢查提交的表單中是否包含Sql注入
167: /// param name="_request">當前HttpRequest對象/param>
168: /// returns>如果包含注入true;否則返回false/returns>
169: ////summary>
170: public bool CheckRequestForm()
171: { 172: if (request.Form.Count > 0)
173: { 174: foreach (string sqlParam in this.request.Form)
175: { 176: if (sqlParam == "__VIEWSTATE") continue;
177: if (sqlParam == "__EVENTVALIDATION") continue;
178: if (CheckKeyWord(request.Form[sqlParam]))
179: { 180: return true;
181: }
182: }
183: }
184: return false;
185: }
186: }
