ASP安全字符串检测函数SafeCheck

2022-07-15 80酷酷网 80kuku.com

　　安全|函数|字符串

'--------------------------------------------------------------------------
'作用:安全字符串检测函数
'名字:SafeCheck
'参数:CheckString,CheckType,CheckLength
'说明:
'Checkstring待检测字符串:任意字符.
'CheckType检测类型0正常短字符1数字2日期3金钱4编码HTML5解码HTML6登录字符串7防攻击检测
'CheckLength检测类型长度:类型为int,当为金钱时为小数点的位置
'返回值:如果通过检测,返回正确字符串,
'如果未通过则返回错误代码SYSTEM_ERROR|ERROR_CODE
'Script Writen by :SnowDu(杜雪.NET)
'Web:http://www.snsites.com/
'--------------------------------------------------------------------------
function SafeCheck(CheckString,CheckType,CheckLength)
On Error Resume Next
ErrorRoot="SYSTEM_ERROR|"
if checkString="" then
SafeCheck=ErrorRoot&"00001"
exit function
end if

CheckString=Replace(CheckString,"'","'")
select case CheckType
case 0
CheckString=trim(CheckString)
SafeCheck=Left(CheckString,CheckLength)
case 1
if not isnumberic(CheckString) then
  SafeCheck=ErrorRoot&"00002"
  exit function
else
  SafeCheck=Left(CheckString,CheckLength)
end if
case 2
tempVar=IsDate(CheckString)
if Not TempVar then
  SafeCheck=ErrorRoot&"00003"
  exit function
else
  select case CheckLength
  case 0
   SafeCheck=FormatDateTime(CheckString,vbShortDate)
  case 1
   SafeCheck=FormatDateTime(CheckString,vbLongDate)
  case 2
   SafeCheck=CheckString
  end select
end if
case 3
tempVar=FormatCurrency(CheckString,0)
if Err then
  SafeCheck=ErrorRoot&"00004"
  exit function
else
  SafeCheck=FormatCurrency(CheckString,CheckLength)
end if
case 4
sTemp = CheckString
If IsNull(sTemp) = True Then
  SafeCheck=ErrorRoot&"00005"
  Exit Function
End If
sTemp = Replace(sTemp, "&", "&")
sTemp = Replace(sTemp, "<", "<")
sTemp = Replace(sTemp, ">", ">")
sTemp = Replace(sTemp, Chr(34), """)
sTemp = Replace(sTemp, Chr(10), "
")
SafeCheck = Left(sTemp,CheckLength)
case 5
sTemp = CheckString
If IsNull(sTemp) = True Then
  SafeCheck=ErrorRoot&"00006"
  Exit Function
End If
sTemp = Replace(sTemp, "&", "&")
sTemp = Replace(sTemp, "<", "<")
sTemp = Replace(sTemp, ">", ">")
sTemp = Replace(sTemp, """, Chr(34))
sTemp = Replace(sTemp, "
",Chr(10))
SafeCheck = Left(sTemp,CheckLength)
case 6
s_BadStr = "' 　&<>?%,;:()`~!#$^*{}[]|+-=" & Chr(34) & Chr(9) & Chr(32)
n = Len(s_BadStr)
IsSafeStr = True
For i = 1 To n
  If Instr(CheckString, Mid(s_BadStr, i, 1)) > 0 Then
   IsSafeStr = False
  End If
Next
if IsSafeStr then
  SafeCheck=left(CheckString,CheckLength)
else
  SafeCheck=ErrorRoot&"00007"
  Exit Function
end if
case 7
s_Filter="net user||/add|select|count|asc|char|mid|'|""|"
S_Filter=S_Filter&"insert|delete|drop|truncate|from|%|declare|-"
S_Filters=split(S_Filter,"|")
isFound=false
for i=0 to ubound(S_Filters)-1
  if Instr(lcase(CheckString),lcase(S_Filters(i)))<>0 then
   isFound=true
   exit for
  end if
next
if isFound then
  SafeCheck=ErrorRoot&"00008"
  Exit Function
else
  SafeCheck=left(CheckString,CheckLength)
end if
end select
end function