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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 60 ciI
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#!/bin/sh 6!itr"
# this program is used to check tcp/ip connections .. BP-N)V)
# and block those ip with excessive connections \ 5j}6Wj
w8$>
2
# my version \I}EW I
myver="1.0RC1" K8 [Um !(
]n"RPktx
# wake up every 120s if last check found abuse client x3U>5F@
wakeup_time_min=120 <ty]z!B
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# wake up every 300s if last check found no abuse client 0,@^<G8?
wakeup_time_max=300 /joY? T
a %kvC#B
# rule timeout 3600s R)SY #*Y
rule_timeout=3600 -L6CEe
eGpKoq7a
# check port list 0&CXR=U5
portlist="80" [~\]<; ;\
Z'!ORn#M
# max established connection per ip 0&Ftx%6%
max_active_conn=8 9v -Y*\!w.
+|X`cmn uU
# iptables chain name FAM:; F30
iptables_chain_name="RH-Lokkit-0-50-INPUT" b.?;I7r
='qVwM
['
# log facility ibwV #6
log_facility="local0" 's5rl
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# Block policy XSK<hr0m
ipchains_block_policy="DENY" LA 2 /<:
iptables_block_policy="REJECT" _Ds,91<muQ
6dz^%Ub
# myself ao .vB']T
myself=`basename $0` ~Sm6 {L
9xzow,mi
mylogger_info() | V{ Q
{ ZbdGI@
logger -p $log_facility.info -t $myself $@ 2>/dev/null |%F4`gz8KP
} HB }rpiB
sb8bCEm- \
mylogger_debug() Nz`v+sp
{ whHuV*K}
logger -p $log_facility.debug -t $myself $@ 2>/dev/null &Q}%b7
} lfC]!=2%~8
y6[ le*T
mylogger_notice() 2?Jw0Wq5D
{ 0}` -vOLd-
logger -p $log_facility.notice -t $myself $@ 2>/dev/null Z~-N'L t{
} > .K%W *t
4Nt4(3Kf
dotimeout() /w5*R5B{
{ 8u
H8)
mylogger_info "reset firewall when timeout arrives" .7b%7dQ<\
case "$firewall" in mR
XR uK
ipchains) Z^as ?k(iM
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null N_iy4W(NU
if [ $? = 0 ] ; then Udn Rsp9S
mylogger_info "ipchains restarted" g\
.$4 N
else $*%,
mylogger_notice "ipchains restart failed" Khc^ q*|C)
fi zi
xG}'
;; C5TV}Bq\
iptables) Fc \]*
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null U1) Z h-aR
if [ $? = 0 ] ; then 5BX ku= M
mylogger_info "iptables restarted" <anKw|
else _]4 p51r0
mylogger_notice "iptables restart failed" -wg}X-'z0
fi m<>BxX
;; J-d
B
*) C]5 kQ1Og
mylogger_notice "neither ipchains nor iptables" Q#SQ@oUzD
;; !R\FCAW[ x
esac R3|4|Jl GR
O |P <s+
} C7NSmZ
0: hv6 Ge^
blockclient() ll X `
{ [t fB*m
5
if [ -z "$1" ] || [ -z "$2" ]; then lm;hW&O9
mylogger_notice "blockclient() missing client or port to block" 4l
%W]'
return o68i0aFW
fi a6DR' BC
local ip port X7L:cVBg
KU` *LB:
ip=$1 |JYb4J4Ni
port=$2 JJ? rVq1g
..u{v}4&
case "$firewall" in 7mMGH
(
ipchains) ZuGd{p$
mylogger_notice "blocking $1 to $2 via ipchains" <.4(#Ebd
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` 2Wluc37
if [ -z "$found" ] ; then oxc; DfJ_
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" B1nm?E 0i
mylogger_debug "cmd: $cmd" MBA?, |9Q#
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` [%dsq`b#
if [ $? != 0 ] ; then }BlyEcw'aN
mylogger_notice "$cmd call failed" gU x}vE-
return 63u%=-T%a
fi %`5 (SC].
new_block=1 iG6]Pr|;e
ever_block=1 zT, @PIC(
else
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mylogger_info "$ip already blocked to $port" E! NtD).=S
fi hTn"/|_SW
;; L4/ns@e
iptables) $"/l*H\h
mylogger_notice "blocking $1 to $2 via iptables" ,#ZPg_x?1
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` /OztkThx=
if [ -z "$found" ] ; then :wIA.1bK}
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" V[/ 9?5pM
mylogger_debug "cmd: $cmd" u$a K19K/
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` -6- sI
if [ $? != 0 ] ; then W $hCI)m(
mylogger_notice "$cmd call failed" 2v ~8fr4
return a^J(TW
/
fi #0<pRDXj
new_block=1 j
"<?9/r
ever_block=1 ^;PjO|mD
Z
else M{24 MF
mylogger_info "$ip already blocked to $port" _ $>);qIP4
fi I2 0~bW
;; mU4(MjP?
*) 0<` qz |_h
mylogger_notice "neither ipchains nor iptables" cF15Mm2
;; #( 614-r/
esac /K li C\
} cN&Eb n
*$0*5d7
restartservice() 3 twA5)v
{ k)>H=? mI
local service n+=qT$w)
if [ -z "$1" ] ; then Xf&YcHo
mylogger_notice "no port given to see which service to be restart" j%'2^C8
return 9~~NxWY%x
fi L-?ty@-i
J t]RU+TB
case "$1" in t j ThQ
80)
s*g qKQ;
service="httpd" 'm*W<
;; Gz{%Z$A~o
25) Lm}.+.O~d
service="postfix" _$$.5?4
;; )=GPhC/sw
110) P ,] ./m\J
service="courier-pop3d" hA 5p'a+K
;; Y({
R\W|
21) % 7mGMa/
service="muddleftpd" _s@PL59,
;; Vc5> I_
53) (mP{A(kwJ
service="named" n yPeN?-
;; P x Q] $w
3306) 8:c=h/fa
service="mysqld" ]CLM'$
;; $$ *tK8 #
esac R4 eu,,J
if [ ! -z "$service" ] ; then z0LspRaz
/etc/init.d/$service restart 1>/dev/null 2>/dev/null w.58=Pr
if [ $? = 0 ] ; then j|pTbOgk%
mylogger_notice "$service restarted" bj@sci(1 ?
else #%QHb,lhl
mylogger_notice "$service restart failed" \k=dqWBr7
fi o#6QwbU25
fi [c=P)t7
V
} cd kEK
" |I.j)
docheckport() hO[_ _j8
{ rkji#\_-FV
mylogger_info "do check port $1" \azMF} mb
local port last_client count client total_count kCEuzd=$V
;MNU T,U
if [ -z "$1" ] ; then G@Z%[YNw
mylogger_notice "docheckport() port not given" >?K=l]!(*
return Ox#vW6;)
fi U&6A)SW,k
,Tar?& C:
port=$1 .9 e5@@VR
'cc8 xC
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` ``< #F3
if [ $? != 0 ] ; then }0\SNpVN
mylogger_notice "netstat call failed" pLe4dz WA
return M zUKp"
fi Qq.$! $
#echo $clientlist hd'fWFW N
# reset new_block a]fFR~ OY
new_block=0
@,1_CqV
count=0 8D`+3
total_count=0 bC+Z R{M
last_client="" Sak^J.~G[
for client in $clientlist kJ"rRsK
do FJH>P \+
#echo "client is $client" Y>aVnixx<
if [ -z "$last_client" ] ; then sryA(V
count=$((count+1)) U@).jpN
total_count=$((total_count+1)) Dti-*LB1
last_client=$client ~SBW`=aP}
else MV zj7~+
if [ "$client" = "$last_client" ] ; then Gi-pi=#&cs
count=$((count+1)) g zi=+oJ|4
total_count=$((total_count+1)) >F^$
' b]
else =%I [
o=6
mylogger_debug "$last_client $count connections" EwG+' nlE
if [ $count -ge $max_active_conn ] ; then [V_mF
mylogger_notice "client $last_client connection $count >= $max_active_conn" 5K9W5hA:D
blockclient $last_client $port jA?[*HB
fi 5YP Iv-
count=1 b/*QV0(
total_count=$((total_count+1)) 3F;0a ;[
last_client=$client w7~]c,$y.
fi ,[p?u']yZz
fi yg}L,JJU<
done =3h
Jti9[
# check the last client sCy.i/y
if [ ! -z "$client" ] ; then =>Ae]mi 7
count=$((count+1)) h\#4[/
total_count=$((total_count+1)) H4v%$R;K
mylogger_debug "$client $count connections" :, H_
e!
X
if [ $count -ge $max_active_conn ] ; then </< z7V,{
mylogger_notice "client $client connection $count >= $max_active_conn" `,pBOh|'
blockclient $client $port _`QME r?
fi gHUW1E
fi 05 6yhB
mylogger_info "total connections on port $port: $total_count" hHw1<! M
nC/T$
#G
if [ $new_block = 1 ] ; then coaJDg+
restartservice $port ' )
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fi Np9Pae'
} jku Nafp}
ND9;%<80
docheckall() !5m~qet.
{ 'uUa|J1mu
# reset wakeup_time z
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wakeup_time=$wakeup_time_max W#b++}S
for port in $portlist _;(Q MeR
do \h zx?
docheckport $port qj*
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if [ $new_block = 1 ] ; then $[=`*m
# set wakeup_time shorter cause we found some abuse client JLyFk V/
wakeup_time=$wakeup_time_min !})3Fb
fi Pt;\]?LVrD
done p-g@c wOu
} Xw^:<Nx:
K
e& fTK
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then tK <) A)
firewall="ipchains" kS7T ' [d
fi ~0.@1 zEXj
]}0+7Q
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then R91u6r#
firewall="iptables" n_] OYG>U
fi ~Uz|sQ*G
JeCEj=_Z
if [ -z "$firewall" ] ; then `V0]t_*D
echo "Error: This machine does not have ipchains or iptables firewall support" wY}+d0Ch
exit 1 Y.Ew;\6U
fi V' ?nS&,i
9zd)[4%=
mylogger_info "firewall.sh v$myver ValueOf.com starting" J.`.lQ$z
mylogger_info "Firewall is: $firewall" veE8
N~0N.
mylogger_info "Port protected: $portlist" }# u}{
mylogger_info "Max connection per ip: $max_active_conn" ^jhHaN ]G^
mylogger_info "Min time to check: $wakeup_time_min""s" 2W~2Hk=0+%
mylogger_info "Max time to check: $wakeup_time_max""s" ?,),%JQ
mylogger_info "Timeout circle: $rule_timeout""s" IweQB} d
mylogger_info "Output is logged to: $log_facility" z?YGE iR/}
Ip 1QmP
# if new ip blocked at this check run? h/w- &7t
new_block=0 -s!PO;qm
# if new ip blocked at this timeout run? cE]kI,Fw,M
ever_block=0 Hm^p^,}_x
# reset wakeup_time *AN#D?X_
wakeup_time=$wakeup_time_max EX 5kF
},L[bDOV07
lasttime=`date +%s` r#~6FpFVK^
q
B 2#EsZ
while [ 1 ] xX
>448=
do 4'8.f5
curtime=`date +%s` Ek. j@79
timediff=$((curtime-lasttime)) +[7u>RJ
#echo "timediff: $timediff" wLbns qa
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then Stw6%T-
lasttime=$curtime Q& \k"X 1
ever_block=0 ?d%}K76V<
dotimeout )G|U B8]
fi `'QPe42
docheckall [6tQv<}^
mylogger_info "sleep for $wakeup_time""s" $7*Ml)H!9
sleep $wakeup_time & Gt9a-ne
done i\'N1S<D
_ 8>"&1n
/L
4WWQ5
ij),DbWd
1. 说明 6bn-NY:i
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， { Q"<q`c
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。 StVv" YY
该程序可以同时保护多个端口 aU! UY(
-wt2ydzos
2. 安装 $b$D[4
tar zxf firewall-1.0b.tar.gz {%Y7]*D
cd firewall-1.0b Z-?9F`}
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh (!(bysi9
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3. 配置 Id0F2 [
主要配置项目如下： ~83P09\T%
# 最小检查周期，缺省为120秒 +*q@= P,
wakeup_time_min=120 J Nz 0!wi
L9@jmh*E
# 最大检查周期，缺省为300秒 ){:aGGtko
wakeup_time_max=600 ;=OH=+R l
(Wqhuw!u
# 重设防火墙状态的时间，缺省为3600秒 gib]#n1!p
rule_timeout=3600 ^d*>P|n*@e
V]}b3Y!(
# 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) as4NvZ@+r
# 一般的网络攻击都是针对80和25，又以80居多 @El<"\
portlist="80 25" cIp h$@
A
h6x 2 (:
# 每个ip可占用的最大活动（Established）连接数 [B o $?
max_active_conn=8 3D0I5LF&
^@2Vh*k
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 mtHz
6+
# 如果用的是ipchains，可以忽略此项 HV.7IyBA^
iptables_chain_name="RH-Lokkit-0-50-INPUT" f,>i%.
]o$ /xP
# 日志输出目标 Pa +BE[z
log_facility="local0" (xed(uFEK
~0 |hobk
**** 关于检查周期 **** ~*Qpv&y)
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.uQ( >n
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。 a7G2C oM8
Y;Gm,
**** ipchains vs iptables **** |$2N$6\SP
目前该程序支持ipchains和iptables两种软件防火墙，使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 Vz]=J;`Mz
/etc/sysconfig/iptables都没有检测到，则报错退出。 P*Sip?tdE
FaE o rQ
**** 日志输出 **** El
s= :4
程序的输出信息记录在系统日志中，目标是local0。如果没有特殊配置，可以在/var/log/messages中看到。建议在/etc/syslog.conf NfF:[qwh
中加入一条： 79g>7<vp
local0.* /var/log/firewall.log /ASI 0h
然后重新启动syslog M) XQi/
/etc/init.d/syslog restart PSS/JFZ^
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 I>F h*2
XF$]KA L0
4. 运行 DW&')gfQ
/usr/prima/sbin/firewall.sh & q.Z#7~6`3
fc Xk]W
范例输出： b
CUh^#]x
*** firewall.sh v1.0b ValueOf.com*** 6D"`FPC
Firewall is: ipchains ]},Q`n>$
Port protected: 80 25 wg0.i?R-]
Max connection per ip: 8 <SdJM1%Q o
Min time to check: 120s {eN{Zh5 "
Max time to check: 300s ]V^.!=gh$
Timeout circle: 3600s l!V| T?
Output is logged to: local0 i }F;fWZ`
_|wY[YJ[
察看/var/log/firewall.log，可以看到： Z)T@`B6
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 T-2p`b}h W
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 @<TZH
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 T^;Jz !e
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 f<4q ]HCa
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 {^5 <{j3e
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 V3~a!k
-L
3
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5. 停止 Q*&aC|b&
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
7a]Zws
# ps auxww|grep firewall.sh pMZf!&tM
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh q
'{<c3&
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh
)P9{47
第一行即firewall.sh的进程，用kill命令： 1o~U+s_r
# kill 27932 +' Y( V&
[1] Terminated /usr/prima/sbin/firewall.sh Nw>T $Rz S
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
