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在asp中常用的字符串安全处理函数集合过滤特殊字

发布时间:2023-06-15 14:34:01 所属栏目:Asp教程 来源:
导读:  在asp编写中,我们需要注意特殊字符串的处理,防止被黑客利用。使用asp的朋友一定要参考下。

  复制代码代码如下:

  '=====================================

  '转换内容,防止意外
  在asp编写中,我们需要注意特殊字符串的处理,防止被黑客利用。使用asp的朋友一定要参考下。
 
  复制代码代码如下:
 
  '=====================================
 
  '转换内容,防止意外
 
  '=====================================
 
  Function Content_Encode(ByVal t0)
 
  IF IsNull(t0) Or Len(t0)=0 Then
 
  Content_Encode=""
 
  Else
 
  Content_Encode=Replace(t0,"<","<")
 
  Content_Encode=Replace(Content_Encode,">",">")
 
  End IF
 
  End Function
 
  '=====================================
 
  '反转换内容
 
  '=====================================
 
  Function Content_Decode(ByVal t0)
 
  IF IsNull(t0) Or Len(t0)=0 Then
 
  Content_Decode=""
 
  Else
 
  Content_Decode=Replace(t0,"<","<")
 
  Content_Decode=Replace(Content_Decode,">",">")
 
  End IF
 
  End Function
 
  '=====================================
 
  '过滤字符
 
  '=====================================
 
  Function FilterText(ByVal t0,ByVal t1)
 
  IF Len(t0)=0 Or IsNull(t0) Or IsArray(t0) Then FilterText="":Exit Function
 
  t0=Trim(t0)
 
  Select Case t1
 
  Case "1"
 
  t0=Replace(t0,Chr(32)," ")
 
  t0=Replace(t0,Chr(13),"")
 
  t0=Replace(t0,Chr(10)&Chr(10),"<br>")
 
  t0=Replace(t0,Chr(10),"<br>")
 
  Case "2"
 
  t0=Replace(t0,Chr(8),"")'回格
 
  t0=Replace(t0,Chr(9),"")'tab(水平制表符)
 
  t0=Replace(t0,Chr(10),"")'换行
 
  t0=Replace(t0,Chr(11),"")'tab(垂直制表符)
 
  t0=Replace(t0,Chr(12),"")'换页
 
  t0=Replace(t0,Chr(13),"")'回车 chr(13)&chr(10) 回车和换行的组合
 
  t0=Replace(t0,Chr(22),"")
 
  t0=Replace(t0,Chr(32),"")'空格 SPACE
 
  t0=Replace(t0,Chr(33),"")'!
 
  t0=Replace(t0,Chr(34),"")'"
 
  t0=Replace(t0,Chr(35),"")'#
 
  t0=Replace(t0,Chr(36),"")'$
 
  t0=Replace(t0,Chr(37),"")'%
 
  t0=Replace(t0,Chr(38),"")'&
 
  t0=Replace(t0,Chr(39),"")''
 
  t0=Replace(t0,Chr(40),"")'(
 
  t0=Replace(t0,Chr(41),"")')
 
  t0=Replace(t0,Chr(42),"")'*
 
  t0=Replace(t0,Chr(43),"")'+
 
  t0=Replace(t0,Chr(44),"")',
 
  t0=Replace(t0,Chr(45),"")'-
 
  t0=Replace(t0,Chr(46),"")'.
 
  t0=Replace(t0,Chr(47),"")'/
 
  t0=Replace(t0,Chr(58),"")':
 
  t0=Replace(t0,Chr(59),"")';
 
  t0=Replace(t0,Chr(60),"")'<
 
  t0=Replace(t0,Chr(61),"")'=
 
  t0=Replace(t0,Chr(62),"")'>
 
  t0=Replace(t0,Chr(63),"")'?
 
  t0=Replace(t0,Chr(64),"")'@
 
  t0=Replace(t0,Chr(91),"")'/
 
  t0=Replace(t0,Chr(92),"")'/
 
  t0=Replace(t0,Chr(93),"")']
 
  t0=Replace(t0,Chr(94),"")'^
 
  t0=Replace(t0,Chr(95),"")'_
 
  t0=Replace(t0,Chr(96),"")'`
 
  t0=Replace(t0,Chr(123),"")'{
 
  t0=Replace(t0,Chr(124),"")'|
 
  t0=Replace(t0,Chr(125),"")'}
 
  t0=Replace(t0,Chr(126),"")'~
 
  Case Else
 
  t0=Replace(t0, "&", "&")
 
  t0=Replace(t0, "'", "'")
 
  t0=Replace(t0, """", """)
 
  t0=Replace(t0, "<", "<")
 
  t0=Replace(t0, ">", ">")
 
  End Select
 
  IF Instr(Lcase(t0),"expression")>0 Then
 
  t0=Replace(t0,"expression","e­xpression", 1, -1, 0)
 
  End If
 
  FilterText=t0
 
  End Function
 
  '=====================================
 
  '过滤常见字符及Html
 
  '=====================================
 
  Function FilterHtml(ByVal t0)
 
  IF Len(t0)=0 Or IsNull(t0) Or IsArray(t0) Then FilterHtml="":Exit Function
 
  IF Len(Sdcms_Badhtml)>0 Then t0=ReplaceText(t0,"<(//|)("&Sdcms_Badhtml&")", "<$1$2")
 
  IF Len(Sdcms_BadEvent)>0 Then t0=ReplaceText(t0,"<(.[^>]*)("&Sdcms_BadEvent&")", "<$1$2")
 
  t0=FilterText(t0,0)
 
  FilterHtml=t0
 
  End Function
 
  Function GotTopic(ByVal t0,ByVal t1)
 
  IF Len(t0)=0 Or IsNull(t0) Then
 
  GotTopic=""
 
  Exit Function
 
  End IF
 
  Dim l,t,c, i
 
  t0=Replace(Replace(Replace(Replace(t0," "," "),""",chr(34)),">",">"),"<","<")
 
  l=Len(t0)
 
  t=0
 
  For I=1 To l
 
  c=Abs(Asc(Mid(t0,i,1)))
 
  IF c>255 Then t=t+2 Else t=t+1
 
  IF t>=t1 Then
 
  gotTopic=Left(t0,I)&"…"
 
  Exit For
 
  Else
 
  GotTopic=t0
 
  End IF
 
  Next
 
  GotTopic=Replace(Replace(Replace(Replace(GotTopic," "," "),chr(34),"""),">",">"),"<","<")
 
  End Function
 
  Function UrlDecode(ByVal t0)
 
  Dim t1,t2,t3,i,t4,t5,t6
 
  t1=""
 
  t2=False
 
  t3=""
 
  For I=1 To Len(t0)
 
  t4=Mid(t0,I,1)
 
  IF t4="+" Then
 
  t1=t1&" "
 
  ElseIF t4="%" Then
 
  t5=Mid(t0,i+1,2)
 
  t6=Cint("&H" & t5)
 
  IF t2 Then
 
  t2=False
 
  t1=t1&Chr(Cint("&H"&t3&t5))
 
  Else
 
  IF Abs(t6)<=127 then
 
  t1=t1&Chr(t6)
 
  Else
 
  t2=True
 
  t3=t5
 
  End IF
 
  End IF
 
  I=I+2
 
  Else
 
  t1=t1&t4
 
  End IF
 
  Next
 
  UrlDecode=t1
 
  End Function
 
  Function CutStr(byVal t0,byVal t1)
 
  Dim l,t,c,i
 
  IF IsNull(t0) Then CutStr="":Exit Function
 
  l=Len(t0)
 
  t1=Int(t1)
 
  t=0
 
  For I=1 To l
 
  c=Asc(Mid(t0,I,1))
 
  IF c<0 Or c>255 Then t=t+2 Else t=t+1
 
  IF t>=t1 Then
 
  CutStr=Left(t0,I)&"..."
 
  Exit For
 
  Else
 
  CutStr=t0
 
  End IF
 
  Next
 
  End Function
 
  Function CloseHtml(ByVal t0)
 
  Dim t1,I,t2,t3,Regs,Matches,J,Match
 
  Set Regs=New RegExp
 
  Regs.IgnoreCase=True
 
  Regs.Global=True
 
  t1=Array("p","div","span","table","ul","font","b","u","i","h1","h2","h3","h4","h5","h6")
 
  For I=0 To UBound(t1)
 
  t2=0
 
  t3=0
 
  Regs.Pattern="/<"&t1(I)&"( [^/</>]+|)/>"
 
  Set Matches=Regs.Execute(t0)
 
  For Each Match In Matches
 
  t2=t2+1
 
  Next
 
  Regs.Pattern="/</"&t1(I)&"/>"
 
  Set Matches=Regs.Execute(t0)
 
  For Each Match In Matches
 
  t3=t3+1
 
  Next
 
  For j=1 To t2-t3
 
  t0=t0+"</"&t1(I)&">"
 
  Next
 
  Next
 
  CloseHtml=t0
 
  End Function
 
 

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