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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 ;{0% Vp{
98vn"=3
#!/bin/sh e488}h6#m
# this program is used to check tcp/ip connections *@W B aN+
# and block those ip with excessive connections hE'>8 {
]@CXUa,>a
# my version * o <|^,R
myver="1.0RC1" zXkq2\GHA
J6@RIia
# wake up every 120s if last check found abuse client (^]3l%Ed
wakeup_time_min=120 ^KV:.up6
u]]mbER*t#
# wake up every 300s if last check found no abuse client n ;> r
wakeup_time_max=300 mqY= N~/O
} ^ *`&Lh
# rule timeout 3600s _*xY>?Aq
rule_timeout=3600 MFipX E!
f{|n/j;n=C
# check port list J8[aVG
portlist="80" >A}ra ^gU
}|RL6p-/'
# max established connection per ip q3|SZoN
max_active_conn=8 xFA`sAucr
j_b/ 66JyN
# iptables chain name 7>EMr}f C
iptables_chain_name="RH-Lokkit-0-50-INPUT" %~0]o@LW7
(.b!kfC
# log facility @[Wf!8_
log_facility="local0" ${97G#
V3/OKI\o
# Block policy AU;Iif6
ipchains_block_policy="DENY" gA 19f
iptables_block_policy="REJECT" dE 3M
upq3)t_
# myself SXV2Y-
myself=`basename $0` s,M] f,T
6 I43a1[s
mylogger_info() P7 5@Yu(
{ dd4^4 X`j
logger -p $log_facility.info -t $myself $@ 2>/dev/null m=w #l>!
} =~q $k
$]a*ZHd;2&
mylogger_debug() $M1;d1e6'
{ T6\d ]
logger -p $log_facility.debug -t $myself $@ 2>/dev/null p# >,{
} 8boiJku`
HLqDI lL
mylogger_notice() +77j2W_0
{ LDDt=HEY4
logger -p $log_facility.notice -t $myself $@ 2>/dev/null $6d5W=u$H
} 1([?EfC
ayN[y
dotimeout()
2l~qzT-
{ =
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mylogger_info "reset firewall when timeout arrives" o%$R`;
case "$firewall" in )0=H)k0
ipchains) EIOP+9zP
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null jTqE V
(
if [ $? = 0 ] ; then 6dRvx;d
mylogger_info "ipchains restarted" - P4X@s_;
else >ffQ264g=i
mylogger_notice "ipchains restart failed" pO2XQYhrY
fi M2A_T.F=H
;;
e )]
iptables) - I~\
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null \{o<- S;h
if [ $? = 0 ] ; then E .CG
mylogger_info "iptables restarted" +,eF(VS !
else "[CR5q9Pr
mylogger_notice "iptables restart failed" W}WDj:
fi &p55Cg@e)
;; %'Z`425a
*) E/ ^N
mylogger_notice "neither ipchains nor iptables" O
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;; /WI H#M
esac 4^Z bT
Ag;Ybk[
} .Z@ i z5
gdg
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blockclient() \ns}
M3
{ )J
8mn*
if [ -z "$1" ] || [ -z "$2" ]; then sLc,Dx" +
mylogger_notice "blockclient() missing client or port to block" `F_R J.g*p
return perhR!#J
fi p R ! m
local ip port k: z)Sw
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ip=$1 !fJy7Y
port=$2 x}uDW
s6Il3K f
case "$firewall" in ! _- Uwg
ipchains) Mwa Rwk
;
mylogger_notice "blocking $1 to $2 via ipchains" D=M'g}l
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` _CizU0S
if [ -z "$found" ] ; then )k81
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" l=<},_]{
mylogger_debug "cmd: $cmd" w3"%d~/[x
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` .RWq!Z=)3
if [ $? != 0 ] ; then $]4o!Z
mylogger_notice "$cmd call failed" 5m?9O7Pg
return -`
1)yhS
fi 5YXMnYt9
new_block=1 )4n]n:FjN
ever_block=1
>j&k:
else *~d<]U5h
mylogger_info "$ip already blocked to $port" cea e~
fi :#=B wdC
;; I:YE6${k!
iptables) dlMjy$/T
mylogger_notice "blocking $1 to $2 via iptables" '_" S/X +v
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` -5@hU8B'a
if [ -z "$found" ] ; then J4?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" VI)hA
^ S
mylogger_debug "cmd: $cmd" Z*. rv t
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` jV#1d8qm
if [ $? != 0 ] ; then /`7G 7pQ+
mylogger_notice "$cmd call failed" [o.#$ (
return y_T%xWK
5
fi jgBJs^JgYG
new_block=1 a4",BDx
ever_block=1 wYh ]3
else w
}
r mYQ
mylogger_info "$ip already blocked to $port" kWgrsN+Z
fi !ozHS_
;; Jjh=zxR>
*) 0kaM YV?
mylogger_notice "neither ipchains nor iptables" H:o=gP60]
;; L tK,
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esac $^W|@et{
]
} TIn o"tc3
|j 4;XaG)
restartservice() un yU|B
{ ,N8SP
'R
local service ;B;wU.Y"
if [ -z "$1" ] ; then -c %'f&P
mylogger_notice "no port given to see which service to be restart" cq8JpS B(
return Jv~^hN2
fi /=KEM gI?
AdRK )L
case "$1" in &Vg)/t;
80) 8/-hODoT_
service="httpd" r^,"OM]
;; 'w_Qs~6~{
25) C%"aj^u
service="postfix" 66sc Bi_d
;; ^-(DokdBn
110) KR>o 2
service="courier-pop3d" P5v;o9B &
;; \
F)}brPc
21) _[N*k"
service="muddleftpd" [!`5kI
;; 'v5q/l
53) 18> v\Hi<
service="named" {X-a6OQj
;; !'> ,37()
3306) 5`q#~fJ2
service="mysqld" p,7?rI\ N
;; 2h1P!4W85
esac "lL/OmG
if [ ! -z "$service" ] ; then 1+qP7 3a^
/etc/init.d/$service restart 1>/dev/null 2>/dev/null CM)V^k*
if [ $? = 0 ] ; then Ka$lNL3<j
mylogger_notice "$service restarted" [ZS.6{vr
else D{JwZL@7k2
mylogger_notice "$service restart failed" ~Jl q.S '
fi I 1Yr{(ho
fi @IOl0db
} D0h 6j0r 5
T75N0/teS
docheckport() | Gr @Mi5
{
T N F
mylogger_info "do check port $1" :)%cL8Nz]$
local port last_client count client total_count $ SZIJe"K
#It!D5A
if [ -z "$1" ] ; then *pyC<4W
mylogger_notice "docheckport() port not given" .p(r|5(b
return t;_1 / mt
fi o8S P#ET"n
2m9qg-W
port=$1 /buj(/q^#
$9Gra#
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` Z
4c^6v
if [ $? != 0 ] ; then 3;R`_#t+
mylogger_notice "netstat call failed" $)'L bOe
return BRv#`
fi x M/WS':V
#echo $clientlist c)c_Qv
# reset new_block kH=
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new_block=0 }&%&0$%
count=0 FA;B :O@:'
total_count=0 KVoM\ttP
last_client="" 1+Vei<H$
for client in $clientlist #r]GnC,
do !>Q{co'
#echo "client is $client" <80M$a
g
if [ -z "$last_client" ] ; then jJ?G7Q5 l
count=$((count+1)) ac8su0
total_count=$((total_count+1)) <)o xs ]<
last_client=$client =.,XJIw&
else Me^L%%: @
if [ "$client" = "$last_client" ] ; then Y> K8^GS
count=$((count+1)) ,.&D{ $1W
total_count=$((total_count+1)) fqn;,!D?9
else $=T q<W*c
mylogger_debug "$last_client $count connections" rEs!gG
NN
if [ $count -ge $max_active_conn ] ; then t`1~5#?Du(
mylogger_notice "client $last_client connection $count >= $max_active_conn" Qd}h:U ^
blockclient $last_client $port
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fi uFaT~ 4
count=1 V b?_RE_H
total_count=$((total_count+1)) .GF Ky
last_client=$client Ex{;&UWm
fi )F6p+i="
fi -U@yc x|r
done ?y^ ix+ M
# check the last client f1t?<=3Ek<
if [ ! -z "$client" ] ; then 3GZrVhU?m
count=$((count+1)) a( x#6
total_count=$((total_count+1)) Vtk}>I@%
mylogger_debug "$client $count connections" ^k!u
if [ $count -ge $max_active_conn ] ; then Z
FIgKWZ'
mylogger_notice "client $client connection $count >= $max_active_conn" {tnhP^C3>
blockclient $client $port pFEU^]V3*
fi yI's=Iu`
fi 6Q`7>l.|?
mylogger_info "total connections on port $port: $total_count" 83Fmu/(
X&,a=#C^
if [ $new_block = 1 ] ; then pwV {
@h!
restartservice $port N0fmC*1-
fi j7C&&G q
}
@T{I;8S
9tB :1n}
docheckall() 1(4IcIR5T;
{ ))uki*UNK
# reset wakeup_time }k6gO0z
wakeup_time=$wakeup_time_max 3 L;&MG=
for port in $portlist </qli-fXB}
do " R-P e\W
docheckport $port ~Yl%{1
if [ $new_block = 1 ] ; then wdEQB-dA
# set wakeup_time shorter cause we found some abuse client :UDe\zcd "
wakeup_time=$wakeup_time_min pg4j
PuCM
fi >\ PNKpn{
done |z.Ov&d4)(
} C?PgC~y)
{I QCA-AI
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then M"z3F!
-j
firewall="ipchains" CGCSfoS9f
fi gK- $y9]~+
I#](mRJ6
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then |dk9/xdX
firewall="iptables" 2(NN QU@Uz
fi
c|~f[
__,}/|K2
if [ -z "$firewall" ] ; then O:te;l
Q K
echo "Error: This machine does not have ipchains or iptables firewall support" `Z~\& r=
exit 1 REKv&^ FLN
fi !$.h[z^
|PW . CV0,
mylogger_info "firewall.sh v$myver ValueOf.com starting" F7qQrE5bl
mylogger_info "Firewall is: $firewall" N^B
y#Z
mylogger_info "Port protected: $portlist" #wZBWTj.
mylogger_info "Max connection per ip: $max_active_conn" 3']=w@~ O[
mylogger_info "Min time to check: $wakeup_time_min""s" aG/L'we
R
mylogger_info "Max time to check: $wakeup_time_max""s" NW@guhK .
mylogger_info "Timeout circle: $rule_timeout""s" X4:SH> U!
mylogger_info "Output is logged to: $log_facility" +#0,2 wR#
gIaPS0Q
# if new ip blocked at this check run? ,daZ K
xT
new_block=0 b>"=kN/
# if new ip blocked at this timeout run? tD !$!\`O
ever_block=0 lhhp6-r
# reset wakeup_time .#$D\cwV
wakeup_time=$wakeup_time_max z2.Z xL"*
yW)X
asn
lasttime=`date +%s` b py576GwA
M4(`o^n
while [ 1 ] G u P1
do ImVHX~ qHJ
curtime=`date +%s` ia}V8 i
timediff=$((curtime-lasttime)) #9) D.d|5
#echo "timediff: $timediff" YXWlg %s
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then KF4}cM=.5
lasttime=$curtime t=$Hv
ever_block=0 rq>Om MQ67
dotimeout wX*F'r" z
fi ' Zmslijf
docheckall IHlTp0?
mylogger_info "sleep for $wakeup_time""s" \a}W{e=FNT
sleep $wakeup_time P1f@?R&t+
done >k{KwFB^S
EZvf\s>LT
N N;'QiE
79JU
1. 说明 Pw h0Se5Z
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， ~)\E&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。 4]$$ar)
该程序可以同时保护多个端口 ?H2{R:
^7
oX Ju=
2. 安装 +`)4j x)r/
tar zxf firewall-1.0b.tar.gz a9 CK4Kg
cd firewall-1.0b NlnmeTL O5
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh 56
ra ZC
O~WT$
3. 配置 5, <:|/r
主要配置项目如下： L 93KsI
# 最小检查周期，缺省为120秒 Px<*n '~}
wakeup_time_min=120 ]VU a $$
K !MI A
# 最大检查周期，缺省为300秒 *j0kb"#
wakeup_time_max=600 ^Q'^9M2)
jK{)gO
# 重设防火墙状态的时间，缺省为3600秒 3Y}X7-|)Z
rule_timeout=3600 *75?%l
n
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# 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) j\ Z/R1RcW
# 一般的网络攻击都是针对80和25，又以80居多 )j[rm
portlist="80 25" !}gC0dJ
8"\g?/
# 每个ip可占用的最大活动（Established）连接数 eaI!}#>R +
max_active_conn=8
FB-_a
E9L)dMZSpj
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 )
OAd[u<
# 如果用的是ipchains，可以忽略此项 T!T6M6?
iptables_chain_name="RH-Lokkit-0-50-INPUT" :$`"M#vMX
w lM"Zt
# 日志输出目标 ]i3 1@O
log_facility="local0" ];.H]TIc6
'7!b#if
**** 关于检查周期 **** BihXYux*
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 $ 'B0ZL
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。 xt%-<%s %f
O+Zt*jN;
**** ipchains vs iptables **** #N=!O/Y
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 AQ>8] `e`
/etc/sysconfig/iptables都没有检测到，则报错退出。 m{/?6h 1
ng-g
\&-
**** 日志输出 **** `|1#Vuk
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 >&| C
E 2'
中加入一条： u'o."J^&'
local0.* /var/log/firewall.log }4! R
2c
然后重新启动syslog E6{|zF/3'
/etc/init.d/syslog restart ^MyuD?va
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 1CkBfK
/e^q>>z
4. 运行 =AhXEu ^
/usr/prima/sbin/firewall.sh & Z\{"/( Hi
" .9 b}}
范例输出： kvzGI>H:
*** firewall.sh v1.0b ValueOf.com*** A8? uCkG
Firewall is: ipchains VpDNp
(2
Port protected: 80 25 < p<J;@
Max connection per ip: 8 2L#$WuM~^
Min time to check: 120s zFy0Sz F
Max time to check: 300s u? a* bW
Timeout circle: 3600s y#'|=0vTvP
Output is logged to: local0 LV4]YC
|U*wMYC
察看/var/log/firewall.log，可以看到： ]]\\Y|0
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 STDT]3.
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 9o|=n'o
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 ZGUhje!
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 JG%y_
Qy?K
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 b ~khb!]
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 rkF]Q_'`t;
? mdgY1
5. 停止 qNI 2+<u)j
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 S]kY'(V(*
# ps auxww|grep firewall.sh [FHSFr
E,5
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh H"_ ZqEg
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh v(+9&
第一行即firewall.sh的进程，用kill命令： }<y-`WB
# kill 27932 {&_1/
[1] Terminated /usr/prima/sbin/firewall.sh |!VSed#FSn
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
