描述
網(wǎng)絡(luò)防火墻通過設(shè)置不同的安全規(guī)則來控制設(shè)備或系統(tǒng)之間的數(shù)據(jù)流,在實(shí)際應(yīng)用中主要用于分析與互聯(lián)網(wǎng)連接的TCP/IP協(xié)議簇。防火墻在網(wǎng)絡(luò)中使用的前提是必須保證網(wǎng)絡(luò)的連通性,其通過規(guī)則設(shè)置和協(xié)議分析,來限制和過濾那些對(duì)管理比較敏感、不安全的信息,防止未經(jīng)授權(quán)的訪問。由于工業(yè)控制與商用網(wǎng)絡(luò)的差異,常規(guī)的網(wǎng)絡(luò)安全設(shè)置規(guī)則用在控制網(wǎng)絡(luò)上就會(huì)存在很多問題。只有正確地設(shè)計(jì)、配置和維護(hù)硬件防火墻的規(guī)則,才可以保護(hù)工業(yè)控制網(wǎng)絡(luò)系統(tǒng)的安全環(huán)境。建議設(shè)置的特殊規(guī)則包SCADA和工業(yè)協(xié)議。MODBUS/TCP、EtherNet/IP和DNP3等在工業(yè)控制系統(tǒng)中被大量使用,但是這些協(xié)議在設(shè)計(jì)時(shí)沒有安全加密機(jī)制,通常也不會(huì)要求任何認(rèn)證便可以在遠(yuǎn)程對(duì)一個(gè)控制裝置執(zhí)行命令。這些協(xié)議應(yīng)該只被允許在控制網(wǎng)絡(luò)單向傳輸,不準(zhǔn)許在辦公網(wǎng)絡(luò)穿透到控制網(wǎng)絡(luò)。能夠完成這一功能的工業(yè)防火墻或者安全路由器,通常被部署在具有以太網(wǎng)接口的I/O設(shè)備和控制器上,從而避免因設(shè)備聯(lián)網(wǎng)而造成的病毒攻擊或廣播風(fēng)暴,還可以避免各子系統(tǒng)間的病毒攻擊和干擾。
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