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<p><FONT class=normalfont><B><font color=blue>用LIDS增強(qiáng)Linux系統(tǒng)安全</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>來自：Linux知識(shí)寶庫<br>聯(lián)系方式：無名<br><br>LIDS( Linux入侵偵察系統(tǒng))是Linux內(nèi)核補(bǔ)丁和系統(tǒng)管理員工具(lidsadm)，它加強(qiáng)了Linus內(nèi)核。 它在內(nèi)核中實(shí)現(xiàn)了一種安全模式 -- 參考模式以及內(nèi)核中的Mandatory Access Contro l（命令進(jìn)入控制）模式。本文將闡述LIDS的功能和如何使用它來建立一個(gè)安全的Linux系統(tǒng)。<br>
<br>
1. 為什么選擇LIDS<br>
<br>
隨著互連網(wǎng)上Linux越來越受歡迎 ,越來越多現(xiàn)有GNU/LINUX系統(tǒng)上的應(yīng)用軟件中的安全漏洞被發(fā)現(xiàn)。很多程序利用了程序員的粗心，例如緩存溢出、格式化代碼攻擊。當(dāng)系統(tǒng)安全受到程序的危及，黑客獲得ROOT權(quán)限以后，整個(gè)系統(tǒng)將被入侵者控制。<br>
<br>
由于代碼的開放性，我們可以獲得很多所希望Linux應(yīng)用程序的原代碼，并且根據(jù)我們的需要來修改。所以bug能很容易地被找到，并很快修補(bǔ)。但是當(dāng)漏洞被揭示后，而系統(tǒng)管理員疏于給漏洞打補(bǔ)丁，從而造成很容易地就被入侵，更糟的是黑客能獲得ROOT SHELL。利用現(xiàn)有的GNU/Linux系統(tǒng)，他為所欲為。這正是LIDS想要解決的問題。<br>
<br>
首先看看現(xiàn)有的GNU/Linux系統(tǒng)存在哪些問題。<br>
<br>
文件系統(tǒng)未受到保護(hù)<br>
<br>
系統(tǒng)中的很多重要的文件，例如 /bin/login，一旦黑客入侵后，他可以上傳修改過的l<br>
ogin文件來代替/bin/login ，然后他就可以不需要任何登陸名和密碼就登陸系統(tǒng)。這常被稱<br>
為Trojan house。<br>
<br>
進(jìn)程未受到保護(hù)<br>
<br>
系統(tǒng)上運(yùn)行的進(jìn)程是為某些系統(tǒng)功能所服務(wù)的，例如HTTPD是一個(gè)web服務(wù)器來滿足遠(yuǎn)程客戶端對于web的需求。作為web服務(wù)器系統(tǒng)，保護(hù)其進(jìn)程不被非法終止是很重要的。但是當(dāng)入侵者獲得了ROOT權(quán)限后，我們卻無能為力。<br>
<br>
系統(tǒng)管理未受保護(hù)<br>
<br>
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