asp防sql注入攻击技巧实例详解
asp项目,在sql查询使用字符串拼接情况下，会受到sql注入攻击，可以使用敏感词过滤和参数化语句进行修改。
Dim Fy_Post,Fy_Get,Fy_In,Fy_Inf,Fy_Xh,Fy_db,Fy_dbstr,Kill_IP,WriteSql'自定义需要过滤的字串,用 "|" 分隔Fy_In = "'|;|and|(|)|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|exist|drop"Kill_IP=TrueWriteSql=True '----------------------------------Fy_Inf = split(Fy_In,"|")'--------POST部份------------------If Request.Form "" Then For Each Fy_Post In Request.Form For Fy_Xh=0 To Ubound(Fy_Inf) If Instr(LCase(Request.Form(Fy_Post)),Fy_Inf(Fy_Xh)) 0 Then Response.Redirect "/index.asp" Response.End End If Next NextEnd IfIf Request.QueryString "" Then For Each Fy_Get In Request.QueryString For Fy_Xh=0 To Ubound(Fy_Inf) If Instr(LCase(Request.QueryString(Fy_Get)),Fy_Inf(Fy_Xh)) 0 Then Response.Redirect "/index.asp" Response.End End If Next NextEnd If
对敏感词URL进行过滤,重定位或进行其他处理
Public Function execSqlOpen(connect,cursorType,lockType,args()) set cmdTemp = server.CreateObject("ADODB.Command") cmdTemp.ActiveConnection = connect cmdTemp.Prepared = true cmdTemp.CommandText = args(0) Dim i For i = 1 To UBound(args) set paramTemp = cmdTemp.CreateParameter("",201,1,Len(args(i))+10,args(i)) cmdTemp.Parameters.Append paramTemp Next set rsTemp=server.CreateObject("adodb.recordset") rsTemp.open cmdTemp,,cursorType,lockType set execSqlOpen = rsTempend functionPublic Function execSqlExecute(connect,args()) set cmdTemp = server.CreateObject("ADODB.Command") cmdTemp.ActiveConnection = connect cmdTemp.Prepared = true cmdTemp.CommandText = args(0) Dim i For i = 1 To UBound(args) set paramTemp = cmdTemp.CreateParameter("",201,1,Len(args(i))+10,args(i)) cmdTemp.Parameters.Append paramTemp Next set execSqlExecute = cmdTemp.executeend function
封装这两个函数,然后进行修改
1.使用open的调用execSqlOpen(需要调用close,视原代码是否close决定),使用execute的调用execSqlExecute(不调用close)2.需要返回值的用set 一个变量接收,不需要的用call调用3.表名动态拼接的,无法使用占位符,使用原始拼接方式4.使用like的,内部使用?占位,外部使用字符串拼接前后%( % keyword % )例子如下:
sql="select * from table where column='" column "'"set rs=server.CreateObject("ADODB.recordset")rs.Open sql,conn,1,1= dim argsargs = Array("select * from table where column = ?",column)set rs = execSqlOpen(conn,1,1,args)
sql="select * from table where 1=1 and column1='" request("column1") "'"if column2 "" thensql=sql " and column2 like '%" column2 "%'"end ifif column3 "" thensql=sql " and column3 =" column3 ""end ifsql=sql " order by column4 desc;"Set rs= Server.CreateObject("ADODB.Recordset")rs.open sql,conn,1,1= dim argsargs = Array("select * from table where 1=1 and column1=?",request("column1"))if column2 "" thenargs(0)=args(0) " and column2 like ?"ReDim Preserve args(UBound(args)+1)args(UBound(args)) = "%" column2 "%"end ifif column3 "" thenargs(0)=args(0) " and column3 =?"ReDim Preserve args(UBound(args)+1)args(UBound(args)) = column3end ifargs(0)=args(0) " order by column4 desc;"set rs = execSqlOpen(conn,1,1,args)
Set Rs_t=Conn.Execute("Select column From " table " where column1=" column1)= dim argsargs = Array("Select column From " table " where column1=?",column1)set Rs_t = execSqlExecute(conn,args)
set rs=conn.execute("select * from table where column=" request("column"))= dim argsargs = Array("select * from table where column = ?",request("column"))set rs = execSqlExecute(conn,args)
conn.execute("update table set column = '" column "'")= dim argsargs = Array("update table set column = ?",column)call execSqlExecute(conn,args)
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asp防sql注入攻击技巧实例详解
