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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 u{/!BCKE
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#!/bin/sh R8u i LZd
# this program is used to check tcp/ip connections yzml4/ X
# and block those ip with excessive connections ~H0WHqcy
G#~6a%VW
# my version t\p_QWnF
myver="1.0RC1" 3}}#'5D
GsG9;6c+u
# wake up every 120s if last check found abuse client ?D^l&`S
wakeup_time_min=120 wJb \Q
&;)6G1X1
# wake up every 300s if last check found no abuse client }+_Z| >qv
wakeup_time_max=300 [P*w$Hn
otsINAizgS
# rule timeout 3600s k?Bc^7l:
rule_timeout=3600 <( 0TK5
# Moju
# check port list [}/\W `C
portlist="80" oXR%A 7
^c9~~m16+
# max established connection per ip XOM@Pi#z
max_active_conn=8 Y^?J3[@
@ jE<V=?
# iptables chain name XG5mfKMt+
iptables_chain_name="RH-Lokkit-0-50-INPUT" C?FUc cI
!50Fue^JM
# log facility .<|7BHL
log_facility="local0" | Wrf|%p
Q6cF <L`bW
# Block policy v :YW[THre
ipchains_block_policy="DENY" nKFua l3
iptables_block_policy="REJECT" 6 ]@H.8+
x. 7Ln9
# myself _fH.#C
myself=`basename $0` uC>X;<^
* Yr)>;^
mylogger_info() xQ
`>
\f
{ /{ .
logger -p $log_facility.info -t $myself $@ 2>/dev/null c}II " P
} F*F
U[ 5
,X&lVv#
mylogger_debug() ?hh
4M
{ ZB'/D O=i
logger -p $log_facility.debug -t $myself $@ 2>/dev/null _MfB,CS
} l@FPTHq
,C88%k
mylogger_notice() 5MH\Gq e7
{ }fW@8ji\
logger -p $log_facility.notice -t $myself $@ 2>/dev/null vMsb@@O\\
} *KO 4H
/wB< 1b"
dotimeout() K@P5 ]}'#
{ [kx_Izi/T
mylogger_info "reset firewall when timeout arrives" `}ak;^Me
case "$firewall" in LB_y lfg
ipchains) 3jIi$X06
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null agqB# ,i
if [ $? = 0 ] ; then
h&\%~LO.
mylogger_info "ipchains restarted" [ Y
_6PR
else 4oT1<n`r+
mylogger_notice "ipchains restart failed" xQX,1NbH5
fi $v?+X20
;; $d
M:
5 y
iptables) `# &pB0.y
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null > $0eRVL
if [ $? = 0 ] ; then Z -`j)3Y
mylogger_info "iptables restarted" ] %jlaXb
else 4]jN@@
mylogger_notice "iptables restart failed" Be+CV">2
fi |'WaBy1
;; DTrS9j?z
*) ((
wG
K|d
mylogger_notice "neither ipchains nor iptables" lwhAF, '$
;; e0%?;w-TL
esac } )O ^xF ~
S 8mqz.
} @EH:4~
_ETG.SYq
blockclient() .8hB <G
{ }I;A\K]
if [ -z "$1" ] || [ -z "$2" ]; then %;kr%%t%
mylogger_notice "blockclient() missing client or port to block" } 5i
0R
return 6>ZUx}vYj
fi 8MgoAX,p
local ip port u"r~5
|i'V\"
hW
ip=$1 MVU5+w X
port=$2 U^SJWYi<Y
.|XIF
case "$firewall" in Wf /Gt\?
ipchains) |>a
sGP
mylogger_notice "blocking $1 to $2 via ipchains" (yWU9q)5
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` u5^fiw]C
if [ -z "$found" ] ; then ez_qG=J .
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" @'`!2[2'?
mylogger_debug "cmd: $cmd" 62K 7afH
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` cmF&1o3_
if [ $? != 0 ] ; then q
y73
mylogger_notice "$cmd call failed" ^
l|{*oj2
return
/n;-f%dL
fi 3a #2 }
new_block=1 n[ip'*2L
ever_block=1 B9pro%R1Bo
else n;8[WR)
mylogger_info "$ip already blocked to $port" ^6s
<
fi @Z> {/
;; DdDO.@-Z
iptables) xrDHXqH
mylogger_notice "blocking $1 to $2 via iptables" = #]^H c
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` 1o\P7P Le
if [ -z "$found" ] ; then _4F(WCco
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" oLK-~[p
mylogger_debug "cmd: $cmd" 8o43J;mA
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` -(9>{!",J
if [ $? != 0 ] ; then /NfuR$oMd
mylogger_notice "$cmd call failed" /.r|ron:e
return KdI X`
fi 'fO[f}oa_.
new_block=1 Rd~-.&
ever_block=1 xtW Q.
else rOd<nP^`\
mylogger_info "$ip already blocked to $port" _ u TaN
fi ApHs`0=(
;; #DK@& Gv
*) )
=-$>75Z
mylogger_notice "neither ipchains nor iptables" 4FURm@C6
;; .4E5{F{~
esac AjBwj5K
} xR;>n[
6
Sy|fX_ i
restartservice() )D'SfNx#{
{ G J"S*30
local service T-e'r
if [ -z "$1" ] ; then "(bnr0
mylogger_notice "no port given to see which service to be restart" (;DnL|"'8
return (jb9U k_t
fi 52Sq;X
O[%"zO"S
case "$1" in vbEA d) *S
80) 'fpm] *ig
service="httpd" 32h}+fd
;; 7<FI[
25) W^j;"qj
service="postfix" 7A:k
;; wUb5[m
110) P?| F+RoX$
service="courier-pop3d" #snwRW>=[
;; \"=4)Huv
21) \S #Mc
service="muddleftpd" ]b5E_/P
;; Cj{+DXT
53) NTq#'O) f
service="named" O7<--
;; I*h%e,yIO
3306) HC1jN8WDY
service="mysqld" R= Qa54
;; }ACWSk WK
esac /hrVnk i*
if [ ! -z "$service" ] ; then _#f+@)vR
/etc/init.d/$service restart 1>/dev/null 2>/dev/null 2=R}u-@6p
if [ $? = 0 ] ; then r .-U=ql
mylogger_notice "$service restarted" v67utI SNI
else r0MUv}p#|L
mylogger_notice "$service restart failed" R1,.H92
fi *\gS 2[S
fi s,z$Vt"h*K
} :eHD{=
i^<P@ |q
docheckport() whH_<@!
{ m!'moumL;
mylogger_info "do check port $1" $!?tJ@{
local port last_client count client total_count dSdP]50M
MKdS_&F;~
if [ -z "$1" ] ; then 8%+F .r
mylogger_notice "docheckport() port not given" b\Wlpb=QZ
return c@|!0
U%j
fi to2#PXf]y
{pWb*~!k
port=$1 n0\k(@+k
X=1Po|
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` BB$(0mM^
if [ $? != 0 ] ; then HpXQ D;
mylogger_notice "netstat call failed" J2_~iC&;s
return \Fh#CI
fi w4AA4 u
#echo $clientlist t^k^e{,q#
# reset new_block `] fud{
new_block=0
Wx8oTN
count=0 Y5/SbQYf1
total_count=0 {0(:5%
last_client="" K|Cb6''
for client in $clientlist $n><p>`
do )01,3J>#
#echo "client is $client" u4KP;_,m
if [ -z "$last_client" ] ; then TXWYQ~]3w
count=$((count+1)) &i5MRw_]]
total_count=$((total_count+1)) W5SCm(QS5
last_client=$client ahUc ;S:v#
else G u4 mP
if [ "$client" = "$last_client" ] ; then m>:zwz< ;
count=$((count+1)) [6u8EP0xM
total_count=$((total_count+1)) x
&
ZW
f?
else O;6am++M@
mylogger_debug "$last_client $count connections" i]{-KZC
if [ $count -ge $max_active_conn ] ; then
2R`dyg
mylogger_notice "client $last_client connection $count >= $max_active_conn" #,5v#| u|7
blockclient $last_client $port + e3{J_
fi JFOXrRR=d
count=1 -}G>{5.A
total_count=$((total_count+1)) 8q/3} AnI
last_client=$client L#~z#
fi 0Q{^ BgW
fi .kqH}{hf
done AM:lU
# check the last client >g+e`!;6
if [ ! -z "$client" ] ; then w 7e+
~8|
count=$((count+1)) DlF6tcoI
total_count=$((total_count+1)) &<Iz?AVr
mylogger_debug "$client $count connections" gNaB^I Y
if [ $count -ge $max_active_conn ] ; then \(4kEB2s$
mylogger_notice "client $client connection $count >= $max_active_conn" 0ME.O +
blockclient $client $port ><DXT nt'x
fi !g2 ~|G
fi qgk C)
mylogger_info "total connections on port $port: $total_count" 5tUN'KEbN
2od 9Q=v~
if [ $new_block = 1 ] ; then Z~Vups#+f
restartservice $port \wb0%>
0
fi iji2gWV}h
} AD@-H0Y
\eoJ6IRE\T
docheckall() @q++eGm\Q
{ _@ A%t&l
# reset wakeup_time sA:k8aj
wakeup_time=$wakeup_time_max BWev(SF{Ny
for port in $portlist !K8V":1du#
do T(q/$p&q
docheckport $port ){FXonVP
if [ $new_block = 1 ] ; then b3^d!#KVM
# set wakeup_time shorter cause we found some abuse client <wj}y0(
wakeup_time=$wakeup_time_min oeF0t'%
fi 9`|~- b
done $e/[!3CASP
} /;V:<mekf
!Jk|ha ~r
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then t(r}jU=qw
firewall="ipchains" 4Tn97G
7
fi R|JBzdK+P
[`_-;/Gx2
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then 9 6j*F,{
firewall="iptables" mb #&yK(h
fi ]v|n'D-?
AB[#
if [ -z "$firewall" ] ; then @*"H{xo.U
echo "Error: This machine does not have ipchains or iptables firewall support" )I(2t 6i
exit 1 w[hT , $n
fi I*OJPFZ^4
Mcm%G#
mylogger_info "firewall.sh v$myver ValueOf.com starting" rlP?Uh
mylogger_info "Firewall is: $firewall" Fz1K*x x'
mylogger_info "Port protected: $portlist" \
ix& U
mylogger_info "Max connection per ip: $max_active_conn" gf^XqTLs
mylogger_info "Min time to check: $wakeup_time_min""s" {L .=)zt>
mylogger_info "Max time to check: $wakeup_time_max""s" G{4lgkyy
mylogger_info "Timeout circle: $rule_timeout""s" 7J[s5'~|
mylogger_info "Output is logged to: $log_facility" Jt|W
%`X>D
%Q y9X+N:
# if new ip blocked at this check run? _h0hl]rf
new_block=0 F,/yK-9
# if new ip blocked at this timeout run? 1 TA\ 6a}
ever_block=0 fYUbr"Oe
# reset wakeup_time m'YYkq(5%Z
wakeup_time=$wakeup_time_max X(dHh O
1/<Z6 ?U
lasttime=`date +%s`
&T2qi'
;'P<#hM[$
while [ 1 ] *Y<1KXFU
do @ zi_@B
curtime=`date +%s` Dh.pH1ZY3n
timediff=$((curtime-lasttime)) <= Aqi91
#echo "timediff: $timediff" GjeRp|_Qd<
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then Yu_`
>s o
lasttime=$curtime i8i~b8r]
ever_block=0 _ Y8j l,J
dotimeout 8c5%~}kG
fi \Ws$@ J-M
docheckall WNWtQ2]
mylogger_info "sleep for $wakeup_time""s" ,@r
0-gL
sleep $wakeup_time !B:wzb _
done Rn5{s3?F~2
{L oNp0i1a
5%;=( Oig
\>p\~[cxt
1. 说明 r9!,cs
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， vCsJnKqK
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。 -P Lh|
该程序可以同时保护多个端口 r
l>e~i
C[Nh>V7=
2. 安装 /{ FSG!
tar zxf firewall-1.0b.tar.gz Be~In~~
cd firewall-1.0b ]=?.LMjnH
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh 8 GW0w
hL}AgY@
3. 配置 (;cvLop
主要配置项目如下： %WAaoR&u
# 最小检查周期，缺省为120秒 rh j_cw
wakeup_time_min=120 W~d^ *LZt
w 'zSV1
# 最大检查周期，缺省为300秒 CQ/ps,~M
wakeup_time_max=600 `
I H*~d]
).8NZ
Aj
# 重设防火墙状态的时间，缺省为3600秒 Z@6xu;O
rule_timeout=3600 Ut
hM?g^
(65|QA
# 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) uh&Qdy!I
# 一般的网络攻击都是针对80和25，又以80居多 ma e@
L
portlist="80 25" n7(/ml+Q_
JV@b(x`
# 每个ip可占用的最大活动（Established）连接数 ]!v\whZ>
max_active_conn=8 d~z%kl
5:
%z"n}|%!
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 - sL4tMP
# 如果用的是ipchains，可以忽略此项 5m9;'SF
iptables_chain_name="RH-Lokkit-0-50-INPUT" LjPpn jU
xaNM
?]%
# 日志输出目标
m*'87a9q0
log_facility="local0" Nc:0op PM
2aJ_[3p/h]
**** 关于检查周期 **** jq( QL%)_O
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
DMiB \o
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。 QS%t:,0lp
UNyk,
#4
**** ipchains vs iptables **** "Zu>cbE
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 <Y+>a#T
/etc/sysconfig/iptables都没有检测到，则报错退出。 #BwOWra
1-~sj)* k
**** 日志输出 **** e,Sxu[2
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 Tzr'3m_
中加入一条： F5%IsAH
local0.* /var/log/firewall.log D | g{]nO
然后重新启动syslog Vw+RR
i (
/etc/init.d/syslog restart jO}<W1qy
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 T[%@B"
t
(Gg
1
4. 运行 !'*1;OQ
/usr/prima/sbin/firewall.sh & nTCwLnX(O
ZG8Xr "
范例输出： Uf#9y182*c
*** firewall.sh v1.0b ValueOf.com*** =`.OKU An
Firewall is: ipchains > r.W \
Port protected: 80 25 K(rWM>Jv
Max connection per ip: 8 b=XHE1^rM
Min time to check: 120s v)<|@TD )
Max time to check: 300s =6gi4 !hE
Timeout circle: 3600s o ^" "=Z
Output is logged to: local0 ~2[mZias
t4<+]]
察看/var/log/firewall.log，可以看到： y\ax?(z
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 t(p}0}Pp
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 n
a+P|'6
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 > *soc!#Y
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 fT.M glJcb
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 F[*/D/y(
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 HM &"2c
lsKQZ@LN`
5. 停止 \ {;3 '<
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 Sh\Jm*5
# ps auxww|grep firewall.sh ]|_ +lik#
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh WkDXWv\{,{
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh 6@FGt3y
第一行即firewall.sh的进程，用kill命令： </D )i
# kill 27932 /i(R~7;?
[1] Terminated /usr/prima/sbin/firewall.sh -l ?\hmDl
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
