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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 &JV e
- .
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#!/bin/sh 6(f[<V!r
# this program is used to check tcp/ip connections {()8 W r
# and block those ip with excessive connections oQBfDD0
5#!pwjt~7
# my version ]/XNfb
myver="1.0RC1" MW &iNioX
SuMK=^>%
# wake up every 120s if last check found abuse client ]6v6&YV
wakeup_time_min=120 9?:SxI;v
{*bXO8vi((
# wake up every 300s if last check found no abuse client n9B1NM5 \
wakeup_time_max=300 rQC{"hS1
U~azI(1"W
# rule timeout 3600s hR
Y *WL
rule_timeout=3600 l Y
yt8H
o}mD1q0yE
# check port list H 1N_
portlist="80" \::<]
eNY$N_P
# max established connection per ip &Y;z[ +(P
max_active_conn=8 &]iX
>m.
qiV#T +\
# iptables chain name ZY-W~p1:G
iptables_chain_name="RH-Lokkit-0-50-INPUT" x3xBl_t
,kfUlv=
# log facility f7mP4[+dS
log_facility="local0" ` {s:lf
;>{B K,
# Block policy c~[L ;_
ipchains_block_policy="DENY" ':lADUt
iptables_block_policy="REJECT" R@-rc|FunJ
% zHs h
# myself WB
Lfxr
myself=`basename $0` by,"Orpwq;
f8'D{OP"G
mylogger_info() c&z@HEzV7
{ _ #288`bU
logger -p $log_facility.info -t $myself $@ 2>/dev/null C
vfm ,BL
} H@GiH e j
6|+I~zJ88
mylogger_debug() *6=2UJcJ
{ `O ?61YUQH
logger -p $log_facility.debug -t $myself $@ 2>/dev/null fT9$0:eO
} ~ \z7$9Q
}a6tG
mylogger_notice() J=|PZ2"
{ @ eu4 W^W
logger -p $log_facility.notice -t $myself $@ 2>/dev/null |{udd~oE&
} GZ(
W6 4
o5)lTVQ~~
dotimeout() 60(j[d-$p
{ E-\Wo3
mylogger_info "reset firewall when timeout arrives" _0p8FhNt
case "$firewall" in [Zc8tE2oN
ipchains) Ze_4MwC W
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null &g%9$*gm T
if [ $? = 0 ] ; then aGY R:jR$
mylogger_info "ipchains restarted" L ldZ"%P
else +j
Z ,vKr
mylogger_notice "ipchains restart failed" J3`a}LyDf
fi I(!i"b9
;; =?hGa;/rb
iptables) %X)w$}WH
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null ^ z!g3
if [ $? = 0 ] ; then c &4EO|
mylogger_info "iptables restarted" =Ji+GJ <,9
else 3fA.DK[4 [
mylogger_notice "iptables restart failed" eW%Ce f
fi mAO$gHQ
;; .=@xTJh
*) !7)` g i
mylogger_notice "neither ipchains nor iptables" x -CTMKX
;; S~L;oX?(!
esac 3azyqpwU$
vl1`s
^}R
} oY)xX x
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u
blockclient() 7T7
A[A\
{ ,_+Gb
if [ -z "$1" ] || [ -z "$2" ]; then 4G ? Cu,$
mylogger_notice "blockclient() missing client or port to block" (tG8HwV-
return tNk.|}
fi 0Ncx':]5
local ip port 5B:% ##Ug5
VPC7Dh%.
ip=$1 C_5o& O8Bc
port=$2 +)J;4B
1:Sq?=&
case "$firewall" in GvB;o^Wd
ipchains) \ t=ls
mylogger_notice "blocking $1 to $2 via ipchains" `eo$o!
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` ,_wpYTl*X
if [ -z "$found" ] ; then +Oxw? `I$
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" -!bfxbP
mylogger_debug "cmd: $cmd" b7uxCH]Z
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` Ld H23\
if [ $? != 0 ] ; then s@$SM,tnn
mylogger_notice "$cmd call failed" 4lp9 0sa
return xU6rZ CqE
fi S'
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new_block=1 uUIjntSF(
ever_block=1 k00&+C
else {9c_T!c
mylogger_info "$ip already blocked to $port" N{}o*
K
fi
C
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;; &_1x-@oI2:
iptables) ~@ H9h<T
mylogger_notice "blocking $1 to $2 via iptables" &=.SbS
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` ^D]y<@01
if [ -z "$found" ] ; then 6uu49x_^L4
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" hpBn_
mylogger_debug "cmd: $cmd" Z~{0x#?4%
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` qmF+@R&^i
if [ $? != 0 ] ; then
=7v bcAJ\
mylogger_notice "$cmd call failed" Rq[ VP#
return CubBD+h l*
fi JTS<n4<a
new_block=1 D> 6vI
ever_block=1 "t >W
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else NGp^/PZX0
mylogger_info "$ip already blocked to $port" /I@`B2
fi aSM S uX8
;; A4 IPd
*) OlcWptM$
mylogger_notice "neither ipchains nor iptables" F !MxC
;; 5X}O Un8
esac d$<1M a}
} 'Im&&uSkr
&B@qb?UE1
restartservice() "*oN~&flc
{ J?[}h&otQ
local service 2`cVi"U
if [ -z "$1" ] ; then rT!9{uK
mylogger_notice "no port given to see which service to be restart" e =4k|8G
return Jh`6@d
fi vy{YGT
A,f%0
eQR
case "$1" in 9
?( P?H
80) 2\L}Ka|v
service="httpd" O/{W:hJjd
;; *h Bo,
25) L}.V`
v{zc
service="postfix" [.*o<
KP
;; - "X}
)N2
110) !#H ca
service="courier-pop3d" cwK OE?!
;; &Vi0.o
21) }hX"A!0
service="muddleftpd" wA>bLPTw
;; %Q[+bN[/
53) >6cENe_@t
service="named" 6P:H`
;; G9uWn%
5r
3306) oO) KhA?
y
service="mysqld" D $[/|%3
;; 4!r>
^a
esac dwt< s [k
if [ ! -z "$service" ] ; then -hP-w>
/etc/init.d/$service restart 1>/dev/null 2>/dev/null bU i@4S
if [ $? = 0 ] ; then Q`X 5W
mylogger_notice "$service restarted" k<3 _!?3
else #O .-/&Z
mylogger_notice "$service restart failed" fMFlY%@ t
fi sP NAG
fi jn;b{*Lf
} 5bzY TK&-
4)3!n*I
docheckport() 4';]fmf@[i
{ 'D4KaM.d
mylogger_info "do check port $1" i#~1|2
local port last_client count client total_count Z0e+CEzq
!u#o"e<qh
if [ -z "$1" ] ; then {M?!nS6t
mylogger_notice "docheckport() port not given" pPG@_9qf
return =c8U:\0
fi uGQCW\!"4
N2_=^s7
port=$1 EN%Xs578
8&=+Mw
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` ~j\/3;^s
if [ $? != 0 ] ; then lC1X9Op
mylogger_notice "netstat call failed" GSW{h[Op
return ~^"cq
S(
fi [21tT/
#echo $clientlist 9& W\BQ
# reset new_block S @ 7A)
new_block=0 ii*Ty!Sa
count=0 *
qG=p`
total_count=0 &fj&UB A
last_client="" ^D
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for client in $clientlist /:e|B;P`k
do %p 2C5z?
#echo "client is $client" 0{PK]qp7
if [ -z "$last_client" ] ; then _uHyE }d
count=$((count+1)) fINM$ 6
total_count=$((total_count+1)) ~9o S~fP?I
last_client=$client IFPywL{K
else TL7-uH
if [ "$client" = "$last_client" ] ; then VUF7-C*
count=$((count+1)) J7QlGm,=
total_count=$((total_count+1)) 1}8e@`G0.]
else I/WnF"yP
mylogger_debug "$last_client $count connections" [1nI%/</>
if [ $count -ge $max_active_conn ] ; then ooZ7HTP|
mylogger_notice "client $last_client connection $count >= $max_active_conn" 2z[Pw0# V
blockclient $last_client $port $LRFG(
fi TTE#7\K~B
count=1 g'Xl>q
total_count=$((total_count+1)) @/0aj
last_client=$client K.z}%a
fi Tz*5;y%4
fi uEi!P2zN
done sa#"@j)
# check the last client @ ~sp:l
if [ ! -z "$client" ] ; then y
ph
count=$((count+1)) #^v5Eo
total_count=$((total_count+1)) VS).!;>z
mylogger_debug "$client $count connections" akqXh 9g
if [ $count -ge $max_active_conn ] ; then tcX7Ua(I`
mylogger_notice "client $client connection $count >= $max_active_conn" "Z{^i3 gN
blockclient $client $port THu a?,oyW
fi }dXL= ul
fi lpp'.HTP
mylogger_info "total connections on port $port: $total_count" -%N (X8
f(_qcgXp
if [ $new_block = 1 ] ; then U50X`J
restartservice $port uyA9`~p=#
fi gvU6 p[D
} 8p 211MQ<
9/%|#b-z
docheckall() iK#{#ebAoW
{ cu"%>>, ,
# reset wakeup_time P L Y7qM w
wakeup_time=$wakeup_time_max E+2y-B)E
for port in $portlist r"Bf@va
do -12v/an]L7
docheckport $port WIGb7}e gR
if [ $new_block = 1 ] ; then <7&b|f$CL
# set wakeup_time shorter cause we found some abuse client UB1/FM4~
wakeup_time=$wakeup_time_min "D k:r/
fi M`<D Z<:<
done wLO/2V}/
} gky_]7Av
5a`}DTB[Co
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then H xlw1(zS
firewall="ipchains" b#m47yTW9<
fi f/B--j q
Z~|J"2.
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then 9N29dp>g{{
firewall="iptables" 3q>"#+R.t
fi NLp D,q{
e>^R 8qM ?
if [ -z "$firewall" ] ; then } :mI6zsNj
echo "Error: This machine does not have ipchains or iptables firewall support" ?MYD}`Cv
exit 1 HA%ye"(y8
fi W% [5~N
#J!?
:(m:
mylogger_info "firewall.sh v$myver ValueOf.com starting" Rv-o__C
!
mylogger_info "Firewall is: $firewall" #r:`bQ0;
mylogger_info "Port protected: $portlist" $ZU(bEUOG
mylogger_info "Max connection per ip: $max_active_conn" zi
,Rk.
mylogger_info "Min time to check: $wakeup_time_min""s" *L RGfk+h
mylogger_info "Max time to check: $wakeup_time_max""s" MUrY>FYgx
mylogger_info "Timeout circle: $rule_timeout""s" b{rmxtx
mylogger_info "Output is logged to: $log_facility" ^ztf:'l@C
o^?{j*)g
# if new ip blocked at this check run? K*9b `%
new_block=0
%\cC]<>
# if new ip blocked at this timeout run? {Y[D!W2y
ever_block=0 VO Qt{v{1|
# reset wakeup_time .y/b$|d,
wakeup_time=$wakeup_time_max h +UscdU l
)US/ bC!M$
lasttime=`date +%s` }dUC^04
_kHpM:;.
while [ 1 ] M 9#QS`G
do =!^ iiHF
curtime=`date +%s` 3 ms/v:\
timediff=$((curtime-lasttime)) \z9?rvT:
#echo "timediff: $timediff" mM* yv
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then k+[KD>;1
lasttime=$curtime -ZP&zOsDr
ever_block=0 u;Eu<jU1
dotimeout U.U.\
fi KeI: /2
docheckall e: LZs0
mylogger_info "sleep for $wakeup_time""s" 1gm/{w6O
sleep $wakeup_time {@5WeWlz~
done TRLeZ0EC
$|(|Qzi%
sBtG}Mo )
LGROEn<*d
1. 说明 )O@ ^H
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， \'+{X(]
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 I"so bZ`
该程序可以同时保护多个端口 R}wwC[{
#A/J^Ko
2. 安装 ~,!hE&LE~
tar zxf firewall-1.0b.tar.gz UD<^r]'x
cd firewall-1.0b W(a'^
#xe
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh 2${,%8"0s
;D"P9b]9$
3. 配置 1gShV ]2
主要配置项目如下： y'!p>/%v
# 最小检查周期，缺省为120秒 O\?5#.
wakeup_time_min=120 _`@Xy! Ye
jaO#> <f
# 最大检查周期，缺省为300秒 K~Au?\{
wakeup_time_max=600 J;=aIiN] R
M,\|V3s
# 重设防火墙状态的时间，缺省为3600秒 W|H4i;u
rule_timeout=3600 NkA6Cp[Q,1
TtwJ,&b
# 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) Og$eQS
# 一般的网络攻击都是针对80和25，又以80居多 e(n 2+S#N
portlist="80 25" >b4YbLkI#
=> :% n
# 每个ip可占用的最大活动（Established）连接数 +A'q#~yILa
max_active_conn=8 |,a%z-l
;ad9{":J#B
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 GwMUIevO_
# 如果用的是ipchains，可以忽略此项 Y1yXB).AH8
iptables_chain_name="RH-Lokkit-0-50-INPUT" MOp=9d+N~
3)C6OF>7
# 日志输出目标 d EQReD
log_facility="local0" KM_)7?`
0i`v:Lq%
**** 关于检查周期 **** 2pxWv
)0
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 $LxG>db
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。 ~51kiQW
%;=IMMK
**** ipchains vs iptables **** Jm]]>K8.3V
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 f
gK2.;>
/etc/sysconfig/iptables都没有检测到，则报错退出。 d6t)gG*5
-~( 0O
**** 日志输出 **** 7 zJrT5
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 R<y Nv
中加入一条： q19k<BqR
local0.* /var/log/firewall.log _q$0lqq~u
然后重新启动syslog # |{BGVp
/etc/init.d/syslog restart .*RB~c
t
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 4hsPbUx9
;I!+ lx3[
4. 运行 OQytgXED
/usr/prima/sbin/firewall.sh & g33<qYxP
+X* F<6mZ
范例输出： l#2r.q^$|
*** firewall.sh v1.0b ValueOf.com*** o ;[C(OS
Firewall is: ipchains sW ]yuu!/
Port protected: 80 25 ]/aRc=Gn
Max connection per ip: 8 ;_?zB NW
Min time to check: 120s WX%h4)z*
Max time to check: 300s S F&M
(=w<
Timeout circle: 3600s ESC
Output is logged to: local0 =R8f)UQYx
W;3
R;
察看/var/log/firewall.log，可以看到： " jl1.Ah
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 @K,2mhE~h
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 5z
9r S<
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 '`M#UuU
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 DHh+%|e
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 S_(&UeTC
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 Qv&T E3
q*HAIw[<y
5. 停止 X)FL[RO%q
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 kN'|,eKH4
# ps auxww|grep firewall.sh w"fCI 13
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh a6;gBoV
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh 2^ zg0!z
第一行即firewall.sh的进程，用kill命令： RtW4 n:c
# kill 27932 sl~b\j
[1] Terminated /usr/prima/sbin/firewall.sh ^K7q<X,
即将其终止
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[楼 主]
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Posted: 2008-01-26 02:12 |
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常州五颜六色网络技术有限公司 -> 网站建设 -> linux自动屏蔽IP工具
