sql|程式|函數|函數 Rem ## 長整數轉換
Function toNum(s, default)
If IsNumeric(s) and s <> "" then
toNum = CLng(s)
Else
toNum = default
End If
End Function
Rem ## SQL 陳述式轉換
Function toSql(str)
If IsNull(str) Then str = ""
toSql = replace(str, "'", "''")
End Function
樣本:
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 & "'"
一般情況下, 通過上面兩個函數的過慮, 可以杜絕網上的SQL注入攻擊!如果你覺得有需要, 可以加上對chr(0)的替換, 將toSql函數改為如下:
Function toSql(str)
If IsNull(str) Then str = ""
str = replace(str, chr(0), "")
toSql = replace(str, "'", "''")
End Function
另注:
***********************************************************************
檢測外部提交的函數
Function CheckUrlRefer()
Dim strLocalUrl, intUrlLen, strUrlRefer
strLocalUrl = "http://127.0.0.1"
intUrlLen = Len(strLocalUrl)
strUrlRefer = LCase(request.ServerVariables("HTTP_REFERER") & "")
'檢測前一個頁面是否來自 strLocalUrl
If Left(strUrlRefer, intUrlLen) = strLocalUrl Then
CheckUrlRefer = True
Else
CheckUrlRefer = False
End If
End Function
***********************************************************************
該函數可以協助你抵擋外部的SQL注入測試, 只需要在頁面的頭部調用即可.
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("對不起,非法URL地址請求!")
response.end
end if
<%
Function SafeRequest(ParaName,ParaType)
'--- 傳入參數 ---
'ParaName:參數名稱-字元型
'ParaType:參數類型-數字型(1表示以上參數是數字,0表示以上參數為字元)
Dim ParaValue
ParaValue=Request(ParaName)
If ParaType=1 then
If not isNumeric(ParaValue) then
Response.write "參數" & ParaName & "必須為數字型!"
Response.end
End if
Else
ParaValue=replace(ParaValue,"'","''")
End if
SafeRequest=ParaValue
End function