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Ewebeditor及fckeditork，90%的網(wǎng)站都是采用這兩種編輯器作為產(chǎn)品或者內(nèi)容的說明部分的編輯窗口，近日，一客戶的外貿(mào)站點(diǎn)基本上快完工了，因客戶產(chǎn)品分類多，故而讓客戶自己在后臺(tái)添加產(chǎn)品，但是客戶反映，在后臺(tái)添加產(chǎn)品時(shí)，如果產(chǎn)品說明內(nèi)容太過復(fù)雜的話，產(chǎn)品怎么也添加不入數(shù)據(jù)庫(kù)中。

當(dāng)時(shí)，我們也好生郁悶，這到底怎么回事，我們親自測(cè)試后臺(tái)添加任意的產(chǎn)品或者文字都能成功，偏偏他就不行，在網(wǎng)站搜索了相關(guān)的如“Ewebeditor 不能添加到數(shù)據(jù)庫(kù)”，似乎找到了一點(diǎn)答案，因Ewebeditor自身沒對(duì)單引號(hào)過濾，導(dǎo)致了添加不到數(shù)據(jù)庫(kù)的問題。于是乎，我們把編輯器換成了fckeditork，可是還是不行，那是Ewebeditor及fckeditork自帶的不完善導(dǎo)致的嗎？為什么一個(gè)簡(jiǎn)單的單引號(hào)會(huì)引發(fā)不能添加到數(shù)據(jù)庫(kù)呢，想到這里，我們想到了分析下入庫(kù)代碼，我們采用的是SQL=insert into product(title,content) values(' " &request("title")& "' ,' "&request("content")& " ' )的寫法，于是我們找到客戶當(dāng)時(shí)COPY進(jìn)編輯器里的內(nèi)容，發(fā)現(xiàn)，果然這內(nèi)容中包括有單引號(hào)，原來，正是由于客戶提交到編輯器里的內(nèi)容中含有單引號(hào)，導(dǎo)致我們的SQL語(yǔ)句變化了，相當(dāng)于原來是SQL=insert into product(title,content) values('內(nèi)容' ,'內(nèi)容' )變成了SQL=insert into product(title,content) values(' 內(nèi)容' ,' 內(nèi)容'' )，我們細(xì)看就知道，就因?yàn)檫@content里多了個(gè)單引號(hào)，SQL語(yǔ)句發(fā)生的嚴(yán)重的寫法錯(cuò)誤，但是，我們也奇怪，既然他寫法錯(cuò)誤，為什么SQL語(yǔ)句不給出錯(cuò)誤提示呢，竟然也會(huì)提示操作成功，想到這里，我們想到了2003年那幾年，普遍的小黑客喜歡用的' or' =' or' 的后臺(tái)入侵法，是乎正是利用了SQL執(zhí)行時(shí)，沒過濾單引號(hào)的BUG，導(dǎo)致SQL怎么執(zhí)行，結(jié)果都返回真，呵呵，沒想到，原以為寫程序盡量圖個(gè)簡(jiǎn)單明了，也是個(gè)錯(cuò)啊。好了，問題找到了，以后，凡是SQL入庫(kù)前，我們都把字段過濾后再傳值，就不會(huì)再出這樣的問題了，下面是一個(gè)非常完善的SQL安全過濾函數(shù)，大家直接拿去就可以調(diào)用了。

Function HTMLEncode(Str)
 If Isnull(Str) Then
     HTMLEncode = ""
     Exit Function
 End If
 Str = Replace(Str,Chr(0),"", 1, -1, 1)
 Str = Replace(Str, """", """, 1, -1, 1)
 Str = Replace(Str,"<","&lt;", 1, -1, 1)
 Str = Replace(Str,">","&gt;", 1, -1, 1)
 Str = Replace(Str, "script", "&#115;cript", 1, -1, 0)
 Str = Replace(Str, "SCRIPT", "&#083;CRIPT", 1, -1, 0)
 Str = Replace(Str, "Script", "&#083;cript", 1, -1, 0)
 Str = Replace(Str, "script", "&#083;cript", 1, -1, 1)
 Str = Replace(Str, "object", "&#111;bject", 1, -1, 0)
 Str = Replace(Str, "OBJECT", "&#079;BJECT", 1, -1, 0)
 Str = Replace(Str, "Object", "&#079;bject", 1, -1, 0)
 Str = Replace(Str, "object", "&#079;bject", 1, -1, 1)
 Str = Replace(Str, "applet", "&#097;pplet", 1, -1, 0)
 Str = Replace(Str, "APPLET", "&#065;PPLET", 1, -1, 0)
 Str = Replace(Str, "Applet", "&#065;pplet", 1, -1, 0)
 Str = Replace(Str, "applet", "&#065;pplet", 1, -1, 1)
 Str = Replace(Str, "[", "&#091;")
 Str = Replace(Str, "]", "&#093;")
 Str = Replace(Str, """", "", 1, -1, 1)
 Str = Replace(Str, "=", "&#061;", 1, -1, 1)
 Str = Replace(Str, "'", "''", 1, -1, 1)
 Str = Replace(Str, "select", "sel&#101;ct", 1, -1, 1)
 Str = Replace(Str, "execute", "&#101xecute", 1, -1, 1)
 Str = Replace(Str, "exec", "&#101xec", 1, -1, 1)
 Str = Replace(Str, "join", "jo&#105;n", 1, -1, 1)
 Str = Replace(Str, "union", "un&#105;on", 1, -1, 1)
 Str = Replace(Str, "where", "wh&#101;re", 1, -1, 1)
 Str = Replace(Str, "insert", "ins&#101;rt", 1, -1, 1)
 Str = Replace(Str, "delete", "del&#101;te", 1, -1, 1)
 Str = Replace(Str, "update", "up&#100;ate", 1, -1, 1)
 Str = Replace(Str, "like", "lik&#101;", 1, -1, 1)
 Str = Replace(Str, "drop", "dro&#112;", 1, -1, 1)
 Str = Replace(Str, "create", "cr&#101;ate", 1, -1, 1)
 Str = Replace(Str, "rename", "ren&#097;me", 1, -1, 1)
 Str = Replace(Str, "count", "co&#117;nt", 1, -1, 1)
 Str = Replace(Str, "chr", "c&#104;r", 1, -1, 1)
 Str = Replace(Str, "mid", "m&#105;d", 1, -1, 1)
 Str = Replace(Str, "truncate", "trunc&#097;te", 1, -1, 1)
 Str = Replace(Str, "nchar", "nch&#097;r", 1, -1, 1)
 Str = Replace(Str, "char", "ch&#097;r", 1, -1, 1)
 Str = Replace(Str, "alter", "alt&#101;r", 1, -1, 1)
 Str = Replace(Str, "cast", "ca&#115;t", 1, -1, 1)
 Str = Replace(Str, "exists", "e&#120;ists", 1, -1, 1)
 Str = Replace(Str,Chr(13),"<br>", 1, -1, 1)
 HTMLEncode = Replace(Str,"'","''", 1, -1, 1)
End Function

該文章在 2010/8/19 22:33:22 編輯過