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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 2WLLI8 Xn~\Vb #!/bin/sh *"OlO}o # this program is used to check tcp/ip connections K8&) kfyI # and block those ip with excessive connections )Ft+eMYti[ n5oX 51J # my version iDcYyNE myver="1.0RC1" Jza?DhSAZ mcidA% # wake up every 120s if last check found abuse client _PGd\>Ve wakeup_time_min=120 }%c>Hh MtF^}/0w!` # wake up every 300s if last check found no abuse client E`xpZ>$mPx wakeup_time_max=300 @@-TW`G7 FSz<R*2 # rule timeout 3600s $e4N4e2x/ rule_timeout=3600 Y~!A"$ $!$If(
7 # check port list } 7:T?
`V: portlist="80" }/\`'LQ [n&ES
\o#( # max established connection per ip )}"`$6:k` max_active_conn=8 ~z]VDEJ{q gMZ+kP` # iptables chain name z`$c4p6G6 iptables_chain_name="RH-Lokkit-0-50-INPUT" 4Z=`; 4M]l~9;A # log facility m]}U!XT log_facility="local0" lIx./Nf sSwY!"; # Block policy ?*xH
HI/ ipchains_block_policy="DENY" CCt\[hl iptables_block_policy="REJECT" z%T|L[(6 XpkOC o 02 # myself 1tI=Dwx myself=`basename $0` 7TI6EKr b$Dh|-8 mylogger_info() Wb cm1I) { X6(s][Wn logger -p $log_facility.info -t $myself $@ 2>/dev/null 9iM%kY#)W } Q
(q&(/ #pK"
^O*! mylogger_debug() rev*G: { v[8+fd)}S logger -p $log_facility.debug -t $myself $@ 2>/dev/null ZMiOKVl } *TI?t
D 6@8z3JW.A mylogger_notice() 7m]J7 +4 { q TN)2G
logger -p $log_facility.notice -t $myself $@ 2>/dev/null 1 JIU5u) } SA=>9L,2 to,\n"$~! dotimeout() )$df6sq { Qr7v^H~E4. mylogger_info "reset firewall when timeout arrives" RB% y($ case "$firewall" in NV9JMB{q ipchains) d(ypFd9z /etc/init.d/ipchains restart 1>/dev/null 2>/dev/null .PR+_a-X if [ $? = 0 ] ; then 7 [u>#8 mylogger_info "ipchains restarted" !d!u{1Y& else &{+ 0a[rN mylogger_notice "ipchains restart failed" 6W=V8 fi R(VOHFvW6 ;; ^w.]1x iptables) xb9+- {<J /etc/init.d/iptables restart 1>/dev/null 2>/dev/null e3 :L]4t if [ $? = 0 ] ; then l$EN7^%w mylogger_info "iptables restarted" ArNQ}F/ else N8#j|yf mylogger_notice "iptables restart failed"
lG94^|U fi YE{t?Y\5 ;; <"P-7/j3j *) ^ W?cuJ8 mylogger_notice "neither ipchains nor iptables" X|eZpIA45 ;; )rG4Nga5} esac Kob,}NgqZ GjHR.
p?- } !@8i(!xb T:Klr=&V blockclient() 9N}\>L)_ { cAEvv[ if [ -z "$1" ] || [ -z "$2" ]; then :\His{% mylogger_notice "blockclient() missing client or port to block" 0C/ZcfFU~ return p T 8?z fi lYQ|NL(): local ip port o1$u;}^ | %(lO>4>| ip=$1 }\7UU?@ n port=$2 NSB6 2 #[lhem] IC case "$firewall" in r%ES#\L6+| ipchains) bh
pku=ov mylogger_notice "blocking $1 to $2 via ipchains" 67&
hXIp found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` K?!qNK if [ -z "$found" ] ; then DdgiY9a. cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" PFh ^Z L mylogger_debug "cmd: $cmd" s.}K?)mH `ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` U@mznf* J if [ $? != 0 ] ; then %7)=k}4 mylogger_notice "$cmd call failed" 3N+lWuE}K return m,E$KHt ( fi .9qK88fU R new_block=1 S 13cQ?4 ever_block=1 XWp8[Cxs else (hzN(Dh mylogger_info "$ip already blocked to $port" KT(Z
#$ fi ~t`s&t'c| ;; +tqErh?Al iptables) /9w>:i81 mylogger_notice "blocking $1 to $2 via iptables" ~9dpB>+ found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` %SM;B-/zHt if [ -z "$found" ] ; then }~XWtWbd- cmd="iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null" yLX $SR mylogger_debug "cmd: $cmd" 1PkCWRpR `iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` 6Dq4Q|C if [ $? != 0 ] ; then $"^K~5Q mylogger_notice "$cmd call failed" >1~
/:DJ return _IDZ.\'>$ fi $<^t][{ new_block=1 t;&XIG~ ever_block=1 <\aeC2~M else x *eU~e_jP mylogger_info "$ip already blocked to $port" <>cS@V5j fi ?{{w[U6NE ;; ~U9K<_U *) ff"wg\O4 mylogger_notice "neither ipchains nor iptables" P#,u9EIJ ;; #o.e
(C esac z$32rt8{`v } 1j<(?MT- nM
)C^$3<t restartservice() H",B[
YK { EdJL&* local service 3FEJ
9ZyG if [ -z "$1" ] ; then RpHl
q mylogger_notice "no port given to see which service to be restart" o`?rj!\ return ?9b9{c'an fi *2'8d8>R%] dhl[=Y`
Q case "$1" in n/H
OP 80)
--$o$EP` service="httpd" IUcL* ;; ${+u-Wfau 25) [M_{~1xX service="postfix" <#63tN9 ;; ]Z JoC!u 110) Q M,!-~t service="courier-pop3d" weitDr6 ;; l.[pnL D 21) |m19fg3u service="muddleftpd" B[vj X"yg ;; BG{f)2F\ 53) R
;& >PFmq service="named" G4&s_M$ ;; \>L,X_DL 3306) `sxfj)s service="mysqld" '[F:uA ;; Z5{a7U4z_ esac }fpya2Xt if [ ! -z "$service" ] ; then ajbe7#} /etc/init.d/$service restart 1>/dev/null 2>/dev/null k1 5vs if [ $? = 0 ] ; then X
@nBj;
mylogger_notice "$service restarted" kH!Z|Ps?R else [;E%o^/^ mylogger_notice "$service restart failed" $o6/dEKQ fi X/]@EF fi a(Y'C`x }
~/:vr E(qYCafC docheckport() U%{GLO { 7AG|'s['= mylogger_info "do check port $1" ^({
)t
local port last_client count client total_count fBO/0uW T&U}}iWN if [ -z "$1" ] ; then V>$( N/1 mylogger_notice "docheckport() port not given" Y~ ~Dg?e return 8(3(kZx S fi pjl%Jm N'^>pSc4W| port=$1 ];r!
M0 \BOoY# !a clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` W?7l-k=S if [ $? != 0 ] ; then EIi<g2pM( mylogger_notice "netstat call failed" hW7u#PY return 6fwNlC/9 fi $Dg-;I #echo $clientlist >Wg=
Tuef # reset new_block T+8Yd(:hX new_block=0 $0* sjXV count=0 jKS j ); total_count=0 egmUUuO last_client="" '.}}k!# for client in $clientlist o$_0Qs$ do J
_s`G #echo "client is $client" 7j&
t{q5 if [ -z "$last_client" ] ; then xL* psj count=$((count+1)) Zl
V total_count=$((total_count+1)) "tEp8m last_client=$client M-WSdG[AJ else ITPE2x if [ "$client" = "$last_client" ] ; then z$ ^d_) count=$((count+1)) 7o4E_ .* total_count=$((total_count+1)) A#>wbHjWF else 'CBwE&AL mylogger_debug "$last_client $count connections" a %go[_w if [ $count -ge $max_active_conn ] ; then ]#~J[uk mylogger_notice "client $last_client connection $count >= $max_active_conn" 0 '&C5v' blockclient $last_client $port lM-\:Q! fi Quth5 count=1 Nr4Fp`b8 total_count=$((total_count+1)) Q`CuZkP( last_client=$client e\)%<G5 fi q/U-WQ<+ fi ,#a4P`q'iC done TtJX(N~ # check the last client LP3#f{U if [ ! -z "$client" ] ; then kV-<[5AWW count=$((count+1)) QW..=}pL total_count=$((total_count+1)) )\U:e:Z ae mylogger_debug "$client $count connections" =i~
= |K! if [ $count -ge $max_active_conn ] ; then @Y
~gd
K mylogger_notice "client $client connection $count >= $max_active_conn" J~x]~}V& blockclient $client $port 6 `6I<OJ\ fi {\Pk;M{Y& fi COi15( G2 mylogger_info "total connections on port $port: $total_count" _ $PeFE2 b
esc7!S if [ $new_block = 1 ] ; then {[uhIJD3g6 restartservice $port (~|)Gmq2 fi za>%hZf\ } |E13W N\|B06X docheckall() O!PGZuF { jS,Pu%fR # reset wakeup_time E2Sj IR} wakeup_time=$wakeup_time_max erI&XI for port in $portlist ['QhC( { do o.$48h
( docheckport $port eg~
Dm>Es if [ $new_block = 1 ] ; then [KUkv # set wakeup_time shorter cause we found some abuse client _Q:ot'(~0- wakeup_time=$wakeup_time_min %g*nd#wG fi 9#H0|zL done 2k!uk6 } I'D 3~UIf NO/$}vw if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then %X\J%Fj firewall="ipchains" Qc33CA fi hW~% :v qY&(O`?m& if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then tzl,r"k3 firewall="iptables" }?b\/l< fi
TrZ!E`~ e_Zs4\^ef if [ -z "$firewall" ] ; then =}ZY`O*/ echo "Error: This machine does not have ipchains or iptables firewall support" {\?f|mmq exit 1 @"cnPLh& fi [:,|g;=Y} c[1{>z{G mylogger_info "firewall.sh v$myver ValueOf.com starting" qZQm*q(jM mylogger_info "Firewall is: $firewall" Fpt
tH?^ mylogger_info "Port protected: $portlist" qHrIs-NR mylogger_info "Max connection per ip: $max_active_conn" [)IaXa mylogger_info "Min time to check: $wakeup_time_min""s" &xj40IZ mylogger_info "Max time to check: $wakeup_time_max""s" X"8$,\wX, mylogger_info "Timeout circle: $rule_timeout""s" qvsfU*wo? mylogger_info "Output is logged to: $log_facility" yl<=_Q z:n
JN%Qb # if new ip blocked at this check run? o
W7;t
new_block=0 Nf~B 1vkp # if new ip blocked at this timeout run? 2}{[J ever_block=0 G*v,-O # reset wakeup_time qztL M?iV wakeup_time=$wakeup_time_max e mq%"
;. Xp^>SSt:4 lasttime=`date +%s` >03JQe_#*L jaTCRn3|< while [ 1 ] ^-}3+YA do ~ "~uXNd curtime=`date +%s` BD ,3JDqT timediff=$((curtime-lasttime)) D@mqfi(x #echo "timediff: $timediff" ,g)9ZP.F if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then I>3G"[t lasttime=$curtime atFu
KYI ever_block=0 I8hmn@ce dotimeout qr/N ?, fi 6dCqS docheckall ffQ&1T< mylogger_info "sleep for $wakeup_time""s" E }w<-]8 sleep $wakeup_time j%&^qD,
done Boa?Ghg X/wqfP |}roR{gc| =HvLuVc 1. 说明 j#XU\G firewall.sh是一个shell脚本程序,每隔一段时间检查tcp连接的统计信息,如果来自某个ip对某个端口的活动连接超过规定的最大数量, lO|H:7 则自动将该IP对该端口的访问屏蔽,并重新启动相应的服务。再每隔一段时间,会重设防火墙到初始状态。 d3C*]|gQ 该程序可以同时保护多个端口 z//6yr D#9W [6 2. 安装 ^coJ"[D tar zxf firewall-1.0b.tar.gz ZGOI8M]@ cd firewall-1.0b
I1(,
J install -m 700 firewall.sh /usr/prima/sbin/firewall.sh 7,"1%^tU ,
v6[#NU_Z 3. 配置 86@@j*c(@k 主要配置项目如下: ~F]- +| # 最小检查周期,缺省为120秒 M:(k7a+[^ wakeup_time_min=120 #/1,Cv yj yz2NB?) # 最大检查周期,缺省为300秒 f;%4O' wakeup_time_max=600
S,v9\wN. Z)(C7,Xu # 重设防火墙状态的时间,缺省为3600秒 G>{;@u rule_timeout=3600 18!0Hl> ]Ikj Z= # 保护的端口列表,缺省为80和25,支持的其他端口包括21(ftp), 110(pop3), 53(named), 3306(mysql) an<tupi[E # 一般的网络攻击都是针对80和25,又以80居多 _B|g)Rdv portlist="80 25" HWGlC < ^IM;D)X&: # 每个ip可占用的最大活动(Established)连接数 X;p,Wq#D' max_active_conn=8 p2y
h s\Cl3 # iptables防火墙规则链名称,必须和/etc/sysconfig/iptables中一致 }EOn=* # 如果用的是ipchains,可以忽略此项 d8
ve$X iptables_chain_name="RH-Lokkit-0-50-INPUT"
YrgwR z0Gh |N@) # 日志输出目标 Qo{^jDe,c* log_facility="local0" &ze'V
, : H,=??wN **** 关于检查周期 **** '&T4ryq3" 程序定义了两个检查周期,如果上次检查中屏蔽了某个IP,则程序会更频繁地检查连接情况,反之则等待更长时间。通过检查周期 r"rID
RQ" 的动态调整,可以有效调度在遭受攻击和正常状态下程序的运行次数。 |g4!Yd y)#Ib*? **** ipchains vs iptables **** J/wot,j^ 目前该程序支持ipchains和iptables两种软件防火墙,使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 6576
RT /etc/sysconfig/iptables都没有检测到,则报错退出。 /5r[M=_ihr .Fh5:WN **** 日志输出 ****
[?Aq#av 程序的输出信息记录在系统日志中,目标是local0。如果没有特殊配置,可以在/var/log/messages中看到。建议在/etc/syslog.conf _.FxqH> 中加入一条: S)$ES6]9/ local0.* /var/log/firewall.log =UNzjmP503 然后重新启动syslog +\.gd L) /etc/init.d/syslog restart UwdcU^xt9 这样,可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 eB!0:nHN Z^`>;n2 4. 运行 Dw6Q2Gnv /usr/prima/sbin/firewall.sh & )Cyrs~ pU`Q[HOs 范例输出: }L@!TWR-Qu *** firewall.sh v1.0b ValueOf.com*** &Cdk%@Tj]B Firewall is: ipchains 0xC{Lf& Port protected: 80 25 P*R`3Y, Max connection per ip: 8 V!3O
1 Min time to check: 120s 81H04L9K 7 Max time to check: 300s ~XQN4Tv- Timeout circle: 3600s 0rA&_K[#-< Output is logged to: local0 S1;#58 + lU:I 察看/var/log/firewall.log,可以看到: cq
%=D
Z Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 $0sUh]7y Oct 16 14:08:55 server firewall.sh: 192.168.0.60 2 connections // 有两个来自192.168.0.60的连接 Ry[VEn>C1 Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 :%)l*[ Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 m_Z%[@L Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 K
)1K ] Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 xAQ=oF
+ lJu2}XRiU 5. 停止 )1Os+0az 先用ps命令察看firewall.sh进程的进程号,然后用kill命令将其终止,如 qnv9?Xh # ps auxww|grep firewall.sh 6#KRI%adw` root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh .z7F58 root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh
\ d+&&ns 第一行即firewall.sh的进程,用kill命令: X9#Od9cNaC # kill 27932 Mfuw y [1] Terminated /usr/prima/sbin/firewall.sh $2
~RZpS 即将其终止
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Posted: 2008-01-26 02:12 |
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