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              Linux基礎教程之iptables/netfilter入門到進階

              隨著互聯網技術的方興未艾,各種網絡應用層出不窮,網絡攻擊、黑客入侵也成了網民暢游互聯網的心頭大患,互聯網安全也愈加受到了人們的重視。網絡防火墻,作為一種簡單高效的互聯網防御手段,逐漸成為了網民暢游網絡世界的保護傘。下面筆者介紹下Linux系統的守衛者——iptables/netfilter。

              ?一 兄弟齊心,其利斷金

              ?iptables/netfilter就像一對兄弟,netfilter是大哥,善使長鉤;iptables是小弟,擅長書記。這兩兄弟一武一文,掌握著守城重任。

              ?netfilter大哥師承名門,身負五把長鉤,每一個流經他的數據流都逃不過他的法眼,只見得五把長鉤上下翻飛舞得水泄不通,將那不符合規則的數據包挑落馬下。這五把長鉤埋伏在城門的五個位置,分別是:NF_IP_PRE_ROUTING、NF_IP_LOCAL_IN、NF_IP_FORWARD、NF_IP_POST_ROUTING、NF_IP_LOCAL_OUT。他們分別對應了下圖的五個位置。

              iptables小弟學富五車,手拿生死簿,記載了亂臣賊子的具體情況,netfilter大哥就是按照生死簿的記載檢查每個數據包,以辨忠奸。

              二 四章生死簿

              生死簿內所載內容分為四個章節:raw、mangle、nat、filter

              raw、mangle記載了極高深的內容,正所謂曲高和寡,平常極少用到。filter里記錄了過濾規則;nat表記錄了地址轉換和端口映射相關規則。

              三 iptables命令

              iptables [-t tablename] {-A|-D|-I|-F|-L|-Z|-P} 鏈名 rule-specification

              -t 指定表名,默認為filter表

              -A 追加防火墻規則

              -D 刪除規則

              -I 插入規則

              -F 清空規則

              -L 列出規則

              -R 替換規則

              -Z 清空計數

              -P 設置鏈默認規則

              鏈管理:

              -N 創建新鏈

              -X 刪除用戶自定義引用計數為0的空鏈

              -E 自定義鏈重命名

              -S 列出選定鏈的規則

              [!] -p 匹配協議

              [!] -s 匹配源地址

              [!] -d 匹配目標地址

              [!] -i 匹配入站網卡地址

              [!] -o 匹配出站網卡地址

              [!] –sport 匹配源端口

              [!] –dport 匹配目的端口

              [!] –src-range 匹配源地址范圍

              [!] –dst-range 匹配目的地址范圍

              [!] –limit 匹配數據表速率

              [!] –mac-source 匹配mac地址

              [!] –state 匹配狀態(INVALID ESTABLISHED NEW RELATED)

              [!] –string 匹配應用層字串

              觸發動作:

              ACCEPT 允許數據包通過

              DROP 丟棄數據包

              REJECT 拒絕數據包通過

              LOG 將數據包信息記錄syslog日志

              DNAT 目標地址轉換

              SNAT 源地址轉換

              MASQUERADE 地址欺騙

              REDIRRECT 重定向

              ?四 filter表規則

              filter表是最常被使用的表,是iptables命令默認修改的表。它包含了3條鏈,分別是input、forward和output,分別用來制定進入本機、轉發和離開本機的數據包規則。

              1? 修改默認規則

              使用iptables -P命令修改默認規則,例如:

              iptables -P INPUT ACCEPT

              建議在input鏈最后添加DROP規則,例如:

              iptables -A INPUT -p tcp -d 172.18.55.7 -j
              DROP

              這樣即使清空規則后也不會斷網。

              2 增、刪、改規則

              使用-A在鏈尾增加規則;使用-I可以指定添加規則的位置,如不指定位置序號,則在開頭增加,例如除了22端口以外,禁止連接本機的端口:

              iptables -A INPUT -p tcp -d 172.18.55.7 -j
              DROP

              iptables -I INPUT -d 172.18.55.7 -p tcp
              –dport 22 ACCEPT

              使用-D可以刪除某條規則,例如刪除某一條規則

              iptabels -D INPUT 1

              3 擴展規則

              擴展規則分為顯式擴展和隱式擴展,顯式擴展是指使用-m參數;隱式擴展是指在-p參數后可以省略-m參數。

              隱式擴展包括的參數有:

              -p tcp

              [!] –source-port,–sport port[:port]

              [!] –destination-port,–dport port[:port]

              [!] –tcp-flags mask comp

              [!] –syn

              -p udp

              [!] –source-port,–sport port[:port]

              [!] –destination-port,–dport port[:port]

              -p icmp

              [!] –icmp-type {type[/code]|typename}

              0/0: echo reply

              8/0:echo request

              顯式擴展包括的參數有:

              -m multiport

              以離散或連續的
              方式定義多端口匹配條件,最多15個;

              [!] –source-ports,–sports port[,port|,port:port]…:指定多個源端口;

              [!] –destination-ports,–dports
              port[,port|,port:port]…:指定多個目標端口;

              例:# iptables -I INPUT? -d
              172.16.0.7 -p tcp -m multiport –dports 22,80,139,445,3306 -j ACCEPT

              -m iprange

              以連續地址塊的方式來指明多IP地址匹配條件;

              [!] –src-range from[-to]

              [!] –dst-range from[-to]

              例:# iptables -I INPUT -d 172.16.0.7 -p tcp -m multiport –dports
              22,80,139,445,3306 -m iprange –src-range 172.16.0.61-172.16.0.70 -j REJECT

              -m time

              以時間或日期作為包過濾條件

              –timestart hh:mm[:ss]

              –timestop hh:mm[:ss]

              [!] –weekdays day[,day…]

              [!] –monthdays day[,day…]

              –datestart YYYY[-MM[-DD[Thh[:mm[:ss]]]]]

              –datestop YYYY[-MM[-DD[Thh[:mm[:ss]]]]]

              –kerneltz:使用內核配置的時區而非默認的UTC;

              -m string

              以字符串為條件過濾數據包

              –algo {bm|kmp}

              [!] –string pattern

              [!] –hex-string pattern

              –from offset

              –to offset

              ~]# iptables -I OUTPUT -m string –algo bm
              –string “gay” -j REJECT

              -m connlimit

              限制每個IP連接服務器的連接數

              –connlimit-upto n

              –connlimit-above n

              ~]# iptables -I INPUT -d 172.16.0.7 -p tcp
              –syn –dport 22 -m connlimit –connlimit-above 2 -j REJECT

              -m limit

              限制連接速率

              –limit rate[/second|/minute|/hour|/day]

              –limit-burst number

              ~]# iptables -I OUTPUT -s 172.16.0.7 -p
              icmp –icmp-type 0 -j ACCEPT

              -m state

              “state”擴展是對”conntrack”子模塊的擴展。? “state”擴展可以依照連接的狀態過濾數據包。

              [!] –state state

              INVALID, ESTABLISHED, NEW, RELATED or
              UNTRACKED.

              NEW: 新連接請求;

              ESTABLISHED:已建立的連接;

              INVALID:無法識別的連接;

              RELATED:相關聯的連接,當前連接是一個新請求,但附屬于某個已存在的連接;

              UNTRACKED:未追蹤的連接;

              state擴展:

              內核模塊裝載:

              nf_conntrack

              nf_conntrack_ipv4

              手動裝載:

              nf_conntrack_ftp

              追蹤到的連接:

              /proc/net/nf_conntrack

              調整可記錄的連接數量最大值:

              /proc/sys/net/nf_conntrack_max

              調整超時時長:

              /proc/sys/net/netfilter/*timeout*

              4 處理動作(跳轉目標)

              -j targetname [per-target-options]

              簡單target:

              ACCEPT, DROP

              擴展target:

              REJECT

              –reject-with type

              LOG

              –log-level

              –log-prefix

              5保存和載入規則:

              保存:iptables-save > /PATH/TO/SOME_RULE_FILE

              重載:iptabls-restore < /PATH/FROM/SOME_RULE_FILE

              -n, –noflush:不清除原有規則

              -t, –test:僅分析生成規則集,但不提交

              五 nat表規則

              iptables不僅可以實現數據包過濾,還可以實現網絡地址轉換,這項功能是通過修改nat表實現的。nat表一般作用在PREROUTING和POSTRONTING鏈上,然后通過FORWARD鏈過濾流經的數據包。

              示例:將流經網關的數據包的源地址改為192.168.10.254

              iptables -t nat -A POSTROUTING -s 172.18.0.0/16 -j SNAT –to-source
              192.168.10.254

              如果是撥號地址,那么可以用MASQUERADE參數

              示例:將流入網關80端口的數據包轉發給192.168.10.2

              iptables -t nat -A PREROUTING -d 172.18.55.7 -p tcp –dport 80 -j DNAT
              –to-destination 192.168.10.2

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