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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 *;@wPT oMN<jAU. #!/bin/sh t+a.,$U # this program is used to check tcp/ip connections X$5 # and block those ip with excessive connections =.z;:0]'n q;,lv3I # my version u@dvFzc myver="1.0RC1" 9)7$UQY fJlNxdVr # wake up every 120s if last check found abuse client wW\[#Ku wakeup_time_min=120 ;mEn@@{ _Z(t**Zh6y # wake up every 300s if last check found no abuse client @ZU$W9g wakeup_time_max=300 Aax;0qGbH E[t0b5h # rule timeout 3600s by<@\n2B:U rule_timeout=3600 aqEZhMy b=r3WkB6 # check port list FGi7KV=N portlist="80" ['o ueOg :V.@:x>id # max established connection per ip > T*`Y0P max_active_conn=8 bVzi^R" Y5tyFi#w[ # iptables chain name [eD0L71[ iptables_chain_name="RH-Lokkit-0-50-INPUT" J-
S.m( t}eyfflZ # log facility 6 ]x?2P% log_facility="local0" /-p!|T}w Mm$\j*f/ # Block policy gbuh04#~ ipchains_block_policy="DENY" o*H U^
iptables_block_policy="REJECT" U|3!ixk>>w dLp1l2h!0 # myself r+bGZ myself=`basename $0` O#U maNj/ 7,SQz6] mylogger_info() Oin9lg-jR { Zkd{EMW logger -p $log_facility.info -t $myself $@ 2>/dev/null #`u}#( } y`va6 %u{ S-Y{Vi"2 mylogger_debug() ~W21%T+ { g.&B8e logger -p $log_facility.debug -t $myself $@ 2>/dev/null #zl1#TC{( } kxhsDD$@p FC1rwXL( mylogger_notice() =R=V { fi
HE`]0 logger -p $log_facility.notice -t $myself $@ 2>/dev/null $YX{gk> } 4"2%mx: tLOGj?/r dotimeout() r)|~Rs!y, { =v<w29P(g mylogger_info "reset firewall when timeout arrives" ,7s>#b' case "$firewall" in Leb
Kzqe ipchains) %<>:$4U@] /etc/init.d/ipchains restart 1>/dev/null 2>/dev/null 5b:1+5iF- if [ $? = 0 ] ; then 0i\>(o mylogger_info "ipchains restarted" Z)|
~ else Yd3lL:M mylogger_notice "ipchains restart failed" FXr^ 4B} fi vt5w(}v( ;; |X=p`iz1& iptables)
Gt*<Awn8 /etc/init.d/iptables restart 1>/dev/null 2>/dev/null f4p*!e if [ $? = 0 ] ; then IIAp-Y~B mylogger_info "iptables restarted" 1#x5
o2n else @S3L%lOH mylogger_notice "iptables restart failed" n
=-vOa% fi )r.Wge ;; zCJ"O9G<V *) %/3+:}@G mylogger_notice "neither ipchains nor iptables" IrZjlnht ;; ,C6( esac +}m`$B}mJ Ct `)R } 8(n>99VVK \Yj_U'2"i blockclient()
#om Gj& { Mcc%&j if [ -z "$1" ] || [ -z "$2" ]; then ^JxVs
7 mylogger_notice "blockclient() missing client or port to block" t?&; return 7a_8007$l fi U`)
";WN local ip port d1#lC*.Sg iJh{,0))g ip=$1 NdJ]\>5oN, port=$2 JVg}XwR {KSLB8gtL case "$firewall" in f]10^y5& ipchains) b6;MTz*k> mylogger_notice "blocking $1 to $2 via ipchains" !]R>D{"" found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` 5n>zJ
~ if [ -z "$found" ] ; then [|$C2Dhw= cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" r!w4Br0 mylogger_debug "cmd: $cmd" -ik$<>{X `ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` !gyW15z' if [ $? != 0 ] ; then O\q6T7bfRW mylogger_notice "$cmd call failed" Jm=3%H return <b
~~X`Z fi ,V!Wo4M new_block=1 }x6)}sz7 ever_block=1 ~Q^.7.-T else >8>s
K(S] mylogger_info "$ip already blocked to $port" a"}ndrc* fi pQZ`dS\ ;; B!x6N" iptables) f^}n# mylogger_notice "blocking $1 to $2 via iptables" MYJMZ3qBi found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` I=Y_EjZD if [ -z "$found" ] ; then |U'`Sc 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" AH#a+<;a
mylogger_debug "cmd: $cmd" ME>Sh~C\ `iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` C!K&d,M if [ $? != 0 ] ; then mxH63$R mylogger_notice "$cmd call failed" ]w*`} return 25 U+L fi
!Qsjn new_block=1 |A|K); ever_block=1 Bs '=YK$ else [@pumH>
mylogger_info "$ip already blocked to $port" 1TzwXX7 fi ;xFB
/, ;; av'[k< *) );S8`V mylogger_notice "neither ipchains nor iptables" Rw63{b/ ;; hVz]', esac D#,A_GA{A } XE0b9q954 @tRDKPh restartservice() zII^Ny8D { L6jwJwD local service Q4L7{^[X if [ -z "$1" ] ; then oBnes* mylogger_notice "no port given to see which service to be restart" 8X? EB6=c return |g!$TUS. fi dtG>iJ YoK )fh$ case "$1" in }Q^*Zq9- 80) (6
RWI# service="httpd" ,CBE&g ;; }dU!PZ9N) 25) Xe\v6gbD service="postfix" L|'B* ;; VHLNJnA 110) Osy_C<O service="courier-pop3d" Da)_OJYE ;; !@arPN$ 21) HqyAo]{GN service="muddleftpd" \nT
V;@F ;; #oR@!? 53) q}z`Z/`/ service="named" 0q]0+o*% ;; 93,7yZ5# 3306) ?O]RQXsZ2 service="mysqld" PH^Gjm ;; CZ{7?:^f esac ZhC,nbM if [ ! -z "$service" ] ; then rz%^l1@- /etc/init.d/$service restart 1>/dev/null 2>/dev/null Jm0.\[J if [ $? = 0 ] ; then (Y^tky$9 mylogger_notice "$service restarted" bV"t;R9 else `9T5Dem|# mylogger_notice "$service restart failed" mGJRCK_ fi z'"Y+EWN fi qN
Ut&# } Y|tK19 U: )Gc docheckport() hR.vJ2oa { Z
B!~@Vf mylogger_info "do check port $1" m4'jTC$ local port last_client count client total_count }O| 9Qb cz|?j if [ -z "$1" ] ; then v?%vB#A^ mylogger_notice "docheckport() port not given" 3Y&4yIx return Qam48XZ > fi C46jVl
Io&HzQW^a port=$1 7;&,LH IcGX~zWr clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` S.<4t
*, if [ $? != 0 ] ; then p(Osz7K mylogger_notice "netstat call failed" :)&vf<JL return v53|)]V fi F!*GrQms #echo $clientlist eg1F[~YL/ # reset new_block -8<vWe new_block=0 f$vTDak count=0 t*u#4I1 total_count=0 n1:q:qMR1 last_client="" ~l*<LXp8 for client in $clientlist 1X9s\JKQ do Fmz+ Xb #echo "client is $client" /H3w7QU
if [ -z "$last_client" ] ; then j2.7b1s count=$((count+1)) yf4L0. total_count=$((total_count+1)) bX`Gv+ last_client=$client y\Utm$)j else \k{[HfVvn if [ "$client" = "$last_client" ] ; then PL
3hrI 5 count=$((count+1)) &ODo7@v`1 total_count=$((total_count+1)) $$"G1<EZ else =9,^Tu| mylogger_debug "$last_client $count connections" sf->8 if [ $count -ge $max_active_conn ] ; then dM P'Vnfj mylogger_notice "client $last_client connection $count >= $max_active_conn" CH;U_b blockclient $last_client $port n;Q8Gg2U fi m8e()8lZ3 count=1 kxJ[Bi# total_count=$((total_count+1)) Im@OAR4,R last_client=$client Xc}XRKiy{ fi evYn
} fi KB(W'M_D\ done jlFlhj:/I # check the last client L$.3,./ if [ ! -z "$client" ] ; then js@L%1r#L count=$((count+1)) 79exZ7| total_count=$((total_count+1)) 8T6N
G!/ mylogger_debug "$client $count connections" $~W5! m if [ $count -ge $max_active_conn ] ; then =!xX{o?64 mylogger_notice "client $client connection $count >= $max_active_conn" 3}F>t{FDk blockclient $client $port <r$h =hM fi #
#2'QNN fi c@3 5\!9 mylogger_info "total connections on port $port: $total_count" yNP4Ey f17E2^(I(} if [ $new_block = 1 ] ; then "QxULiw restartservice $port R_KDY fi ipbhjK$ } Zr2!}jD9a k_7b0dr%F docheckall() kwc
Cf2 { h72/03! # reset wakeup_time &{a!)I> wakeup_time=$wakeup_time_max 5P"R'/[PA_ for port in $portlist n9}BT^4 v do YRX^fZ-b docheckport $port pTwzVz~ if [ $new_block = 1 ] ; then BOw[*hM # set wakeup_time shorter cause we found some abuse client e8^/S^ =&d wakeup_time=$wakeup_time_min rSJ!vQo
Cb fi T:X* done `@],J } otR7E+*3 ZZI}
Ot{ if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then B=& [Z2 firewall="ipchains" N'WTIM3W fi RdWn =; s0f+AS|} if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then N{HAWB{ firewall="iptables" >B**fZ~L fi Uq#2~0n> |ffHOef if [ -z "$firewall" ] ; then )2?]c echo "Error: This machine does not have ipchains or iptables firewall support" ]?@ [Ny=0 exit 1 ;7:} iKU fi K
$-
* e&VC}%m mylogger_info "firewall.sh v$myver ValueOf.com starting" hHJvLs>^ mylogger_info "Firewall is: $firewall" *P=
3Pl?j mylogger_info "Port protected: $portlist" 7wh4~ mylogger_info "Max connection per ip: $max_active_conn" +a.2\Qt2A mylogger_info "Min time to check: $wakeup_time_min""s" K-TsSW$} mylogger_info "Max time to check: $wakeup_time_max""s" %"mI["{ mylogger_info "Timeout circle: $rule_timeout""s" 5WHz_'c
mylogger_info "Output is logged to: $log_facility" qSr]d`7@ &!X<F, # if new ip blocked at this check run? ^t4^gcoZ4Z new_block=0 cmXbkM # if new ip blocked at this timeout run? #wIWh^^ Zy ever_block=0 g,JfT^ # reset wakeup_time O00;0w
u wakeup_time=$wakeup_time_max }jCO@v; (2H
GV+Dg lasttime=`date +%s` M@{?#MkS% CjpGo}a/
while [ 1 ] 9lYfII}4( do Qpmq@iL curtime=`date +%s` s oY\6mHio timediff=$((curtime-lasttime)) <WIIurp #echo "timediff: $timediff" iuY,E if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then USyc D` lasttime=$curtime `qs,V ever_block=0 -8qCCV&1i dotimeout 3Sfd|0^ fi n3~axRPO docheckall w~6UOA8} mylogger_info "sleep for $wakeup_time""s" $}WT"K sleep $wakeup_time gf8o~vKX$G done aNu.4c/5 0R)x"4Ww G7&TMg7i (o|bst][S 1. 说明 9Q,>I6`l 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, ?]D&D:Z?I 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。 iUcX\
uW 该程序可以同时保护多个端口 4O-LLH j<kW+Iio 2. 安装 B%\&Q@X tar zxf firewall-1.0b.tar.gz ]\^O(BzB cd firewall-1.0b p48enH8CO install -m 700 firewall.sh /usr/prima/sbin/firewall.sh ExtC\(X; 1=J& ^O{W 3. 配置 \|S%zX 主要配置项目如下: JY CMW!~ # 最小检查周期,缺省为120秒 gPCf+>X{ wakeup_time_min=120 1@OpvO5 2|bt"y-5r # 最大检查周期,缺省为300秒 l[i4\ CT wakeup_time_max=600 >ZkL`!:s eAW)|=2 # 重设防火墙状态的时间,缺省为3600秒 3zh:~w_ rule_timeout=3600 FQO=}0Hl 1?&|V1vc # 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)
cV6H!\ # 一般的网络攻击都是针对80和25,又以80居多 F3(SbM- portlist="80 25" 7T[$BrO\ mBwz.KEm< # 每个ip可占用的最大活动(Established)连接数 A2gFY} max_active_conn=8 gf>H-718F #,z-Pj?O! # iptables防火墙规则链名称,必须和/etc/sysconfig/iptables中一致 7_oUuNw # 如果用的是ipchains,可以忽略此项 s]99'Q", iptables_chain_name="RH-Lokkit-0-50-INPUT" CjPdN#*l WS[Z[O # 日志输出目标 V7U*09
0*5 log_facility="local0" IoOOS5a Pi"?l[T0 **** 关于检查周期 **** 6V$ )ym*F 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 1,=:an 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。 {v'eP[ z$^wCd: **** ipchains vs iptables **** Nsh/ 目前该程序支持ipchains和iptables两种软件防火墙,使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 Ut2T:%m{ /etc/sysconfig/iptables都没有检测到,则报错退出。 @>(JC]HtR KH#z=_ **** 日志输出 **** ;!f~
程序的输出信息记录在系统日志中,目标是local0。如果没有特殊配置,可以在/var/log/messages中看到。建议在/etc/syslog.conf VB905% 中加入一条: ahgP"Qz local0.* /var/log/firewall.log T+T)~!{% 然后重新启动syslog NpGi3>5 /etc/init.d/syslog restart EE]xZz>o 这样,可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 ! xM=7Q
k v`mB82s 4. 运行 awR !=\ /usr/prima/sbin/firewall.sh & JJ1>)S}X- j)8$hK/e0. 范例输出: ZFMO;'m& *** firewall.sh v1.0b ValueOf.com*** %?n=In(F Firewall is: ipchains (7<G1$:z= Port protected: 80 25 q1xSylE Max connection per ip: 8 ;/V])4= Min time to check: 120s tYTl-c Max time to check: 300s aJv+BX_, Timeout circle: 3600s |in>`:qk Output is logged to: local0 8aHE=x/TL Kn$t_7AF^ 察看/var/log/firewall.log,可以看到: !otseI!!/ Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 f%n ;Z}= 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 I-8I/RRkmP Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 'wFhfZB1!B Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 9[\do@ Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 :mDOqlXW/ Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 QsKnaRT t
c.|mIvw 5. 停止 PUD8 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 Ys_LGfK # ps auxww|grep firewall.sh LtwfL^# root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh lAG@nh^ root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh ?#<'w(^%# 第一行即firewall.sh的进程,用kill命令: MV3K'<Y # kill 27932 l#]#_ [1] Terminated /usr/prima/sbin/firewall.sh 8[,R4@ 即将其终止
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Posted: 2008-01-26 02:12 |
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