Rem ## 长整数转换 Function toNum(s, default) If IsNumeric(s) and s > "" then toNum = CLng(s) Else toNum = default End If End Function
Rem ## SQL 语句转换 Function toSql(str) If IsNull(str) Then str = "" toSql = replace(str, "''", "''''") End Function
示例: Dim sql Dim strWhere, strName, intAge strName = toSql(request("user")) intAge = toNum(request("age"), 20) sql = "SELECT * FROM [USER]" _ "WHERE [AGE] > " strName _ " AND [USERNAME] = ''" intAge "''"
一般情况下, 通过上面两个函数的过虑, 可以杜绝网上的SQL注入攻击!如果你觉得有需要, 可以加上对chr(0)的替换, 将toSql函数改为如下: Function toSql(str) If IsNull(str) Then str = "" str = replace(str, chr(0), "") toSql = replace(str, "''", "''''") End Function
另注:
*********************************************************************** 检测外部提交的函数 Function CheckUrlRefer() Dim strLocalUrl, intUrlLen, strUrlRefer strLocalUrl = "http://127.0.0.1" intUrlLen = Len(strLocalUrl) strUrlRefer = LCase(request.ServerVariables("HTTP_REFERER") "") ''检测前一个页面是否来自 strLocalUrl If Left(strUrlRefer, intUrlLen) = strLocalUrl Then CheckUrlRefer = True Else CheckUrlRefer = False End If End Function *********************************************************************** 该函数可以帮助你抵挡外部的SQL注入测试, 只需要在页面的头部调用即可.
dim qs,errc,iii qs=request.servervariables("query_string") dim nothis(18) nothis(0)="net user" nothis(1)="xp_cmdshell" nothis(2)="/add" nothis(3)="exec%20master.dbo.xp_cmdshell" nothis(4)="net localgroup administrators" nothis(5)="select" nothis(6)="count" nothis(7)="asc" nothis(8)="char" nothis(9)="mid" nothis(10)="''" nothis(11)=":" nothis(12)="""" nothis(13)="insert" nothis(14)="delete" nothis(15)="drop" nothis(16)="truncate" nothis(17)="from" nothis(18)="%" errc=false for iii= 0 to ubound(nothis) if instr(qs,nothis(iii))>0 then errc=true end if next if errc then Response.Write("对不起,非法URL地址请求!") response.end end if
% Function SafeRequest(ParaName,ParaType) ''--- 传入参数 --- ''ParaName:参数名称-字符型 ''ParaType:参数类型-数字型(1表示以上参数是数字,0表示以上参数为字符)
Dim ParaValue ParaValue=Request(ParaName) If ParaType=1 then If not isNumeric(ParaValue) then Response.write "参数" ParaName "必须为数字型!" Response.end End if Else ParaValue=replace(ParaValue,"''","''''") End if SafeRequest=ParaValue End function%>