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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限
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#!/bin/sh [!{*
)4$6
# this program is used to check tcp/ip connections daBu<0\
# and block those ip with excessive connections ".| 9h
~Dr/+h:^\
# my version zQ xZR}'
myver="1.0RC1" JGZ,5RTq4-
i o
cr
# wake up every 120s if last check found abuse client xkl 'Y *
wakeup_time_min=120 ZeK*M PxQ
n6WSTh
# wake up every 300s if last check found no abuse client r6]r+!63"
wakeup_time_max=300 cl2@p@av
O:q}<ljp
# rule timeout 3600s AEK * w4
rule_timeout=3600 uf`o\wqU
z>k6 T4(
# check port list _h_;n S.Y
portlist="80" PiI ):B>
F=B>0Q5
# max established connection per ip qYIBP?`g
max_active_conn=8 %k
NkDI
j]J2,J
# iptables chain name ?C.C?h6F5B
iptables_chain_name="RH-Lokkit-0-50-INPUT" )rhKWg
- J!F((jt
# log facility 4_PMl6qo
log_facility="local0" F.?:Gd1
UOF5&>MLb
# Block policy 2b1LC!'U
ipchains_block_policy="DENY" l/LRr.x
iptables_block_policy="REJECT" :@_CQc*yB
|Y/iq9l
# myself @[zPN[z .
myself=`basename $0` HJBUN 1n
A &w)@DOe
mylogger_info() w
\0=L=J
{ HtY\!_ Ea
logger -p $log_facility.info -t $myself $@ 2>/dev/null :BMU c-[
} PhKJ#D Rbr
%~ Nf,
mylogger_debug() o,bV.O.W
{ ?ZlwRjB\
logger -p $log_facility.debug -t $myself $@ 2>/dev/null 3m7$$ N|
} 'y-IE#!5
qK|r+}g|&
mylogger_notice() a;*&q/{o
{ _z,/!>J
logger -p $log_facility.notice -t $myself $@ 2>/dev/null p4{?Rhb6
} s S5#Q
=5dv38
dotimeout() *XtZ;os]
{ +|#sF,,X4g
mylogger_info "reset firewall when timeout arrives" lt, x(2
case "$firewall" in ,Hy
s9I
ipchains) _?q\tyf3
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null G-"#3{~2
if [ $? = 0 ] ; then d UjdQ
mylogger_info "ipchains restarted" m l?+JbLg0
else qV iky=/-
mylogger_notice "ipchains restart failed" y0(k7D|\
fi vNE91
;; iy$]9Wf6=@
iptables) P.;B
V",
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null mhlJzGr*q
if [ $? = 0 ] ; then B>?. Nr
mylogger_info "iptables restarted" o6vm(I%
else |:H[Y"$1;
mylogger_notice "iptables restart failed" D eXnE$XH
fi t~
U:{g~
;; >xP $A{
*) ^{~y+1lt'
mylogger_notice "neither ipchains nor iptables" sF|<m)Kt{W
;; Iupk+x>
esac h ?p^D Po
2@e<II2ha8
} NaVZ)
<'GI<Hc
blockclient() Q3oVl^ q
{ fep#Kb%"e
if [ -z "$1" ] || [ -z "$2" ]; then \f{C2d/6j
mylogger_notice "blockclient() missing client or port to block" 25YJH1x
return dA AE2}e
fi Keof{>V=CA
local ip port VnIJ$5Y
39m #
ip=$1 @ @# G.
port=$2 YtIJJH
iY*Xm, #
case "$firewall" in \>I&UFfH)4
ipchains) Y q;S%.
mylogger_notice "blocking $1 to $2 via ipchains" i[jAAr$
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` -?e~S\ JH
if [ -z "$found" ] ; then ?}lCS7&
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" AK [9fxrE
mylogger_debug "cmd: $cmd" NTVG'3o
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` o .k#|q
if [ $? != 0 ] ; then = < 33(
mylogger_notice "$cmd call failed" teM&[U
return 5IMh$!/uc
fi B>~E6j7[Mp
new_block=1 jkPXkysm
ever_block=1 q:nYUW o
else ;%U`lE 0
mylogger_info "$ip already blocked to $port" qtgj"4,:`
fi ]HC t%5
;; >xH3*0 Lp
iptables) 0>.'w\,87B
mylogger_notice "blocking $1 to $2 via iptables" $'[(
DwLS
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` #UGbSOoCtn
if [ -z "$found" ] ; then 8SKDL[rN
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" zHx
?-Q&3
mylogger_debug "cmd: $cmd" xp,H5
m%
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` e=_*\`/CN
if [ $? != 0 ] ; then s'5
j vlG
mylogger_notice "$cmd call failed" } *0%wP
return g\6(ezUF*
fi {O!fV<Vx 9
new_block=1 L(X:=)
!K0
ever_block=1 n}._Nb
5
else cLB"<mG
mylogger_info "$ip already blocked to $port"
ozGK
-$
fi 3EzI~Zsx
;; =8<SKY&\X
*) 47t^{WrT
mylogger_notice "neither ipchains nor iptables" oR3$A :!P=
;; UkeW2l`:
esac a:P%
r
} ."=Bx 2
1FY^_dvH
restartservice() _<5>
E
{ 2#|Q =rWB
local service )~!Gs/w6
if [ -z "$1" ] ; then 9BHl 2< &V
mylogger_notice "no port given to see which service to be restart" m~X
:KwK4
return Ba@UX(t
fi !5p 01]7
HW{+THNj
case "$1" in !f" @pR6
80) < v0 d 8
service="httpd" jQ`cfE$sV
;; Dwwh;B
25) iiO 4.@nT
service="postfix" w'cZ\<N[
;; zJtYy4jI)
110) 'fZHtnmc0
service="courier-pop3d" _L&C4 <e'
;; Rrk3
EL
21) /S P^fB* y
service="muddleftpd" <!4'?K -N
;; +vZ-o{}.jO
53) ? NVN&zD]
service="named" C2bN<K
;; Tpkm\_
3306) b+3{ bE
service="mysqld" lZ E x0
;; P m
V:J9
esac !a4pKN`qLY
if [ ! -z "$service" ] ; then 7
2luTR Q
/etc/init.d/$service restart 1>/dev/null 2>/dev/null
,9
if [ $? = 0 ] ; then Nc FHvK
mylogger_notice "$service restarted" x!gu&AA<*
else Smg,1,=
mylogger_notice "$service restart failed" \% rX~UhZ=
fi -:> Mi5/ s
fi 0 FHN
} A"i40 @+
"J7=3$CA
docheckport() t"JfqD E
{ |a/"7B|?\
mylogger_info "do check port $1" jSpmE
local port last_client count client total_count n$B=Vt,
:J}L| `U9
if [ -z "$1" ] ; then #k5Nnv#(J
mylogger_notice "docheckport() port not given" x4R[Q&:M
return 7s1FJm=Y/
fi $oe:km1-D
XwE(&ZCf'b
port=$1 > >F E?@
h@@2vs2
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` @e3O=_m-
if [ $? != 0 ] ; then FE" ksi 9
mylogger_notice "netstat call failed" M7BJ$fA0E
return ?tV $o,11
fi Ae;>
@k/|=
#echo $clientlist o.* 8$$
# reset new_block fu"#C}{
new_block=0 &X
}GJLC3
count=0
4& &((H
total_count=0 pa`"f&JO
last_client="" LlrUJ-uC7
for client in $clientlist 48Vmz
do 294
0M4
#echo "client is $client" u|BD=4*
if [ -z "$last_client" ] ; then T/X[q7O~~4
count=$((count+1)) eR$qw#%c *
total_count=$((total_count+1)) B>AmH%f/
last_client=$client j(AN ] g:
else ]p: s5Q
if [ "$client" = "$last_client" ] ; then ?h2!Z{[0b
count=$((count+1)) ?>92OuG%W?
total_count=$((total_count+1)) f!|7j}3
else ]+u`E
mylogger_debug "$last_client $count connections" 2_'{f1bVxz
if [ $count -ge $max_active_conn ] ; then nYhI 0q
mylogger_notice "client $last_client connection $count >= $max_active_conn" 7O', X Y
blockclient $last_client $port F=?0:2P0bD
fi x|g>Zd/n
count=1 o
EXN$SIs
total_count=$((total_count+1)) ixm-wZI
last_client=$client E4idEQ}H
fi GTgG0Ifeh
fi #e|G!'wdj
done <H03i"Z/S
# check the last client kG 7]<^Os3
if [ ! -z "$client" ] ; then YflM*F`
count=$((count+1)) 9f1,E98w_
total_count=$((total_count+1)) Wwo'pke
mylogger_debug "$client $count connections" @#m@ .
if [ $count -ge $max_active_conn ] ; then \JjZ _R
mylogger_notice "client $client connection $count >= $max_active_conn" ' b1k0 9'
blockclient $client $port jNV)=s^ed[
fi <vS3 [(
fi '& v.h#<
mylogger_info "total connections on port $port: $total_count" K{DsGf ,
2aj9:S
if [ $new_block = 1 ] ; then R2K{vs
restartservice $port 5A Fy6Ab
fi f 0Wbc\L[
} EGJ d:>k
b &]_5 GGc
docheckall() H 5\k`7R
{ gu:8+/W8L
# reset wakeup_time X "hdCY%
wakeup_time=$wakeup_time_max 9feVy\u
for port in $portlist
yn`P:[v
do Ov<EOK+^
docheckport $port kxvzAKz~
if [ $new_block = 1 ] ; then #M/^n0E
# set wakeup_time shorter cause we found some abuse client P6 G&3yPt
wakeup_time=$wakeup_time_min zvEof K
fi cpLlkR O
done <A~a|A-QFR
}
vIzREu|5
"/ 9EUbca
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then ,y>Sq
+
firewall="ipchains" ctk~}( 1#
fi (i 2R1HCa
^ osXM `
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then A.YXK%A%
firewall="iptables" Vf*Z }'
fi iY[+BI:
Bz+zEXBC
if [ -z "$firewall" ] ; then BG&XCn5g|
echo "Error: This machine does not have ipchains or iptables firewall support" ,h<xL-
exit 1 {wL30D^
fi s;!_'1pi@
,%=SO 82W
mylogger_info "firewall.sh v$myver ValueOf.com starting" :HiAjaA1pg
mylogger_info "Firewall is: $firewall" d!P3<:+R[
mylogger_info "Port protected: $portlist" KkJrh@lk
mylogger_info "Max connection per ip: $max_active_conn" '$q=r x
mylogger_info "Min time to check: $wakeup_time_min""s" Vu= e|A#
mylogger_info "Max time to check: $wakeup_time_max""s" ! 'qY
mylogger_info "Timeout circle: $rule_timeout""s" \#( tI 3
mylogger_info "Output is logged to: $log_facility" +x(~!33[G
A||,|He~
# if new ip blocked at this check run? AY x*Ngn
new_block=0 u
mo<9Y
# if new ip blocked at this timeout run? *ufVZzP(
ever_block=0 DQI
b57j
# reset wakeup_time Z<IN>:l
wakeup_time=$wakeup_time_max I<+i
87=
+bDBc?HZ{$
lasttime=`date +%s` {9Ug9e {
~
sS{!z@\Lf
while [ 1 ] 4.e0k<]N`
do 1=L5=uz1d:
curtime=`date +%s` =kP|TR!o-
timediff=$((curtime-lasttime)) U Fz C8
#echo "timediff: $timediff" w!|jL
$5L
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then +R2+?v6
lasttime=$curtime >[0t@Tu,D
ever_block=0 vdaG?+_o
dotimeout M .o H,Kd6
fi H8!)zZ
docheckall OK" fFv
mylogger_info "sleep for $wakeup_time""s" 34F;mr"yp
sleep $wakeup_time !nDiAjj
done V\nj7Gr:sF
>&YUV.mLY
mW=9WV
8 5:KlBe%+
1. 说明 Y(&rlL(sPK
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， _;mA(j
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。 b6NGhkr'\
该程序可以同时保护多个端口 0[ZB ^
$1y8X K7r
2. 安装 }2hU7YWt
tar zxf firewall-1.0b.tar.gz 37 b6w6{D
cd firewall-1.0b i`}!<{k
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh jG`,k*eUrJ
wx8Qz, Z
3. 配置
WH_
W:
主要配置项目如下： watTV \b
# 最小检查周期，缺省为120秒 '{w[) .c.
wakeup_time_min=120 ?vP6~$*B
y!c<P,Lt3f
# 最大检查周期，缺省为300秒 .*B@1q
wakeup_time_max=600 N~ajrv}kd
eD|"?@cE
# 重设防火墙状态的时间，缺省为3600秒 I7HGV(
rule_timeout=3600 !0_/=m A^
yqC158 P
# 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) sI6I5
# 一般的网络攻击都是针对80和25，又以80居多 ^^g u
portlist="80 25" h_Ssm{C\
D?FmlDTr[
# 每个ip可占用的最大活动（Established）连接数 *v$j n
max_active_conn=8 [A'e
7Do%'
V 4&a+MJ@
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 y eam-8
# 如果用的是ipchains，可以忽略此项 Pk; 1q?tGw
iptables_chain_name="RH-Lokkit-0-50-INPUT" ^{YK'60
9g|99Z
# 日志输出目标 m%nRHT0KAf
log_facility="local0" W$< Y**y9m
g nYo/q=K
**** 关于检查周期 **** 2F Y]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 \Xe{vlo>h
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。 Tb!F O"o
;oO_5[,M
**** ipchains vs iptables **** A-, hm=?
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 B.!&z- )#
/etc/sysconfig/iptables都没有检测到，则报错退出。
h;@>E:4Tg
SW5n?Qj3-
**** 日志输出 **** d)0|Q
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 P4LiU2C
中加入一条： e jR_3K^
local0.* /var/log/firewall.log mi1^hl'2
然后重新启动syslog qDqy9u:g
/etc/init.d/syslog restart " $P/ek
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 A%X=yqY
Z ;[xaP\S
4. 运行 z "z
/usr/prima/sbin/firewall.sh & f@q.kD21
6@"E*-z$
范例输出： 8kC$
Z )
*** firewall.sh v1.0b ValueOf.com*** HXX9D&c4R
Firewall is: ipchains 76] Z~^Y
Port protected: 80 25 A-d<[@d0
Max connection per ip: 8 k2fJ
Min time to check: 120s S(^YTb7
Max time to check: 300s BS ?i!Bm 7
Timeout circle: 3600s cP4C< UG
Output is logged to: local0 e&E 7_
Aar
]eY\
察看/var/log/firewall.log，可以看到： &gW<v\6,
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 !T2{xmHKv$
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 {=,G>p
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 rP,|
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 ;#+ I"Ow
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 SL/'UoYm<
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 X"mPRnE330
,L<x=Dg
5. 停止 2Dt^W.!
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
DZ4gp
# ps auxww|grep firewall.sh D=Nt 0y
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh P)XR9&o':
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh /|#2ehE
第一行即firewall.sh的进程，用kill命令： hN*v|LFf1
# kill 27932 .r&CIL >
[1] Terminated /usr/prima/sbin/firewall.sh 65VTKlDD
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
