ASP安全检测与过滤函数SafeCheck

发布: 2007-6-30 18:56 | 作者: admin | 来源: | 查看: 17次 | 进入软件测试论坛讨论

@#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/
@#Web:http://www.knowsky.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,"@#","&#39")
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), "<br>")
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, "<br>",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|xp_cmdshell|/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