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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 h
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#!/bin/sh 6`- jPR
# this program is used to check tcp/ip connections b YPKh
# and block those ip with excessive connections .>nRzgo
],v =]+R
# my version s|ITsz0,td
myver="1.0RC1" 4'Zp-k?5`
V47 0C@
# wake up every 120s if last check found abuse client Xs ?o{]Fe
wakeup_time_min=120 C'X!\}f.b/
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# wake up every 300s if last check found no abuse client 40<m rVl
wakeup_time_max=300 IaXeRq?<
O7IJ%_A&
# rule timeout 3600s E@3 aI
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rule_timeout=3600 -
D $8
#1G:lhkC
# check port list >e"#'K0?\
portlist="80" DDH:)=;z
!GGkdg*-*9
# max established connection per ip {Dmjm{
max_active_conn=8 :4%k9BGAj"
>oe]$r
# iptables chain name :[!j?)%>
iptables_chain_name="RH-Lokkit-0-50-INPUT" Nu7
!8[?r*
5o8EC"
0
# log facility tC9n
k5~
log_facility="local0" N' `A?&2ru
7x4PaX(
# Block policy sp*v?5lW
ipchains_block_policy="DENY" R!N%o~C 2-
iptables_block_policy="REJECT" l2P=R)@{
p"ZG%Ow5Q]
# myself 1HZO9cXJ
myself=`basename $0` =rCIumqD-}
Ak"m 85B
mylogger_info() 5,6"&vU,
{ ah+iZ}E%
logger -p $log_facility.info -t $myself $@ 2>/dev/null
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} 1Z~FCJz
b 7?h
I
mylogger_debug() 8C 9-_Ng`
{ <;Zmjeb+#
logger -p $log_facility.debug -t $myself $@ 2>/dev/null I75DUJqy]
} zv,j M 0-
o!ebs0
mylogger_notice() @8r pD"x
{ D!-g&HBTC
logger -p $log_facility.notice -t $myself $@ 2>/dev/null Ks`J([(W&
} xBi' X
")XHak.JX
dotimeout() G^4hd i3@
{
MC.) 2B7
mylogger_info "reset firewall when timeout arrives" V7f q4O^:
case "$firewall" in 2?ez,*-[
ipchains) P%&0]FCx
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null c?[I?ytl
if [ $? = 0 ] ; then Ata:^qI
mylogger_info "ipchains restarted" %oa-WmWm
else }"%?et(
mylogger_notice "ipchains restart failed" SdxDa
fi 94.D HZqh
;; BdblLUGK#
iptables) k(7&N0V%zz
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null .P%bkD6M
if [ $? = 0 ] ; then Nk V K
mylogger_info "iptables restarted" ] i ,{
else VfC<WVYiZ
mylogger_notice "iptables restart failed" ][h%U rV
fi $f=J2&D,Cz
;; s.N/2F& *W
*) q{I%Q)t)gU
mylogger_notice "neither ipchains nor iptables" Ed,~1GanY
;; 1&evG-#<:
esac u jq =F
Eo
g0TQ+*
} u4F5h PO]
>j(_ [z|v3
blockclient() (\hx` Yh=>
{ q #ClnG*
if [ -z "$1" ] || [ -z "$2" ]; then | w1Bq
mylogger_notice "blockclient() missing client or port to block" }`QUHIF
return tip+q d
fi zrL$]Oy}x
local ip port [OV"}<V
i ,E{f
ip=$1 rc>4vB_ha
port=$2 &(G\[ RWp\
bv9i*]
case "$firewall" in ?U5{Wa85D
ipchains) T/G z94c
mylogger_notice "blocking $1 to $2 via ipchains" [.8BTj1%
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` YpZ +n*&+
if [ -z "$found" ] ; then t ?ZI".>
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" Y E s&
mylogger_debug "cmd: $cmd" 4 \K7xM!
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` *1
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if [ $? != 0 ] ; then oMD>Yw c-
mylogger_notice "$cmd call failed" 5k3n\sqZA
return 3n1;G8Nf
fi m
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new_block=1 +EAsW(F1
ever_block=1 =wHVsdN CN
else t#/YN.@r
mylogger_info "$ip already blocked to $port" P[#e/qnXu|
fi V>%rv' G8
;; Ovt.!8
iptables) 9J*\T(W
mylogger_notice "blocking $1 to $2 via iptables" }[};IqVaK
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` N/'b$m5=
S
if [ -z "$found" ] ; then BB $>h}
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" GR.^glG?6
mylogger_debug "cmd: $cmd" Z{Qu<vy_
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` >,Ci?[pf
if [ $? != 0 ] ; then fZ zoAzfv2
mylogger_notice "$cmd call failed" E`0
?
return r1 m]HFN
fi qQ/^@3tXL
new_block=1 ) VS=E7[
ever_block=1 k&q;JyUi
else B =T'5
&
mylogger_info "$ip already blocked to $port" 4qh?,^Dq
fi #n #}s
;; 8f 4b&ah
*) LTCb @L{^i
mylogger_notice "neither ipchains nor iptables" wn, KY$/
;; SC!RbW@3
esac 4JXeV&5Qk'
} *NaB#;+|k`
0c]/ bs{}
restartservice() ,vawzq[oSy
{ a=1@*ID
local service =.U[$~3q%
if [ -z "$1" ] ; then <CiSK!
mylogger_notice "no port given to see which service to be restart" ^Za-`8#`L
return P[ck84F/
fi {.|CdqwY
TnA-;Ha
case "$1" in j#x
6
80) fk>aqm7D!
service="httpd" )
7@ `ut
;; \fd v]f
25) eA? RK.e
service="postfix" aCj& O:]=
;; vF+7V*<
110) vX"*4m>b?+
service="courier-pop3d" 1#2
I
;; @ioJ] $o7
21) B ahm]2
service="muddleftpd" KqJs ?Won
;; s`8= 3]w
53)
69NeQ$](
service="named" }C?'BRX
;; 7U"g3 a)=
3306) q:0N<$63
service="mysqld" >\#*P'y` d
;; @n /nH ?L
esac $( kF#
if [ ! -z "$service" ] ; then #q $HQ&k
/etc/init.d/$service restart 1>/dev/null 2>/dev/null `UaD6Mc<Mz
if [ $? = 0 ] ; then ]Q1 y NtN
mylogger_notice "$service restarted" ;`{H!w[D
else |aS.a&vwR
mylogger_notice "$service restart failed" 4e7-0}0
fi #gN&lY:CFn
fi _J#zY- j
} /Cr%{'P zk
o:'MpKm
docheckport() *:7rdzn
{ V2EUW!gn
2
mylogger_info "do check port $1" R) h#Vc(
local port last_client count client total_count };zFJ6I8
Dx?,=~W9
if [ -z "$1" ] ; then Bk c
4 TO
mylogger_notice "docheckport() port not given" &6!)jIWJ
return nR~@#P\
fi FD
#8mg
PFjL1=7I
port=$1 :3Ox~o
M|h3Wt~7
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` "&u@d~`-n
if [ $? != 0 ] ; then Bsvr?|L \
mylogger_notice "netstat call failed" "(O>=F&
return (?c"$|^ J
fi dZ@63a>>@
#echo $clientlist 2%m B K
# reset new_block DyQy^G'%l
new_block=0 <%eG:n,#
count=0 d7upz]K9g
total_count=0 tyFzSrfc
last_client="" va@Lz&sAE%
for client in $clientlist \R_ C&=
do 6 H$FhJF
#echo "client is $client" O^
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if [ -z "$last_client" ] ; then q0vQ a
count=$((count+1)) u6JM]kR
total_count=$((total_count+1)) }Sv:`9=
last_client=$client DTL.Bsc-.
else kl:Bfs )b
if [ "$client" = "$last_client" ] ; then
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count=$((count+1)) ;e*!S}C,
total_count=$((total_count+1)) Q;rX;p^W
else Wne@<+m X
mylogger_debug "$last_client $count connections" 26h21Z16q
if [ $count -ge $max_active_conn ] ; then b \2
d s,
mylogger_notice "client $last_client connection $count >= $max_active_conn"
;i+jJ4
blockclient $last_client $port z2GY:<s
fi 1yhDrpm
count=1 s$j,9uRr
total_count=$((total_count+1)) dy[X3jQB
last_client=$client 6'f; -2
fi mC#>33{
fi y:uE3Apm
done ;$g?T~v7
# check the last client f/?P514h
if [ ! -z "$client" ] ; then sW\!hW1*x
count=$((count+1)) dR]m8mdqc1
total_count=$((total_count+1)) y6BAH
mylogger_debug "$client $count connections" Ny/MJ#Lq
if [ $count -ge $max_active_conn ] ; then )^hbsMhO
mylogger_notice "client $client connection $count >= $max_active_conn" J{G?-+`
blockclient $client $port d<Tc7vg4|U
fi :ShT|n7
fi aN3;`~{9
mylogger_info "total connections on port $port: $total_count" J 'r^/
B9S@(/"7
if [ $new_block = 1 ] ; then A=0'Ks
restartservice $port (Q B2T2x
fi )+Pus~w
} \~wMfP8
G3v5KmT
docheckall() Y_P!B^z3
{ ,/unhfs1q
# reset wakeup_time ],].zlN
wakeup_time=$wakeup_time_max -UT}/:a
for port in $portlist ;dhQN }7
do `M6)f?|$.
docheckport $port 0{SL &<&
if [ $new_block = 1 ] ; then C7AUsYM
# set wakeup_time shorter cause we found some abuse client e96k{C`j0
wakeup_time=$wakeup_time_min akQ7K
fi [Vt\$
done v &+R^iLE
} QmIBaMI#
U/BR*Zn]*
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then T[j,UkgGo
firewall="ipchains" 3+b t~J0
fi <9
;!3 xG
ig &Y
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then !f6
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firewall="iptables" Y
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fi 4X|zmr:A
T]p-0?=4vv
if [ -z "$firewall" ] ; then p D+k*
echo "Error: This machine does not have ipchains or iptables firewall support" L8 @1THY
exit 1 S21,VpW\
fi POR\e|hRT]
_<2E"PrT
mylogger_info "firewall.sh v$myver ValueOf.com starting" ?G&ikxl
mylogger_info "Firewall is: $firewall" Z EO WO
mylogger_info "Port protected: $portlist" dC4'{ n| 7
mylogger_info "Max connection per ip: $max_active_conn" >yh2Lri
mylogger_info "Min time to check: $wakeup_time_min""s" ^zgo#J 5O
mylogger_info "Max time to check: $wakeup_time_max""s" 'A[dCc8O
mylogger_info "Timeout circle: $rule_timeout""s" G
vlS%
mylogger_info "Output is logged to: $log_facility" 76` .Y
5
rUdv}.
# if new ip blocked at this check run? @ur+;IK$
new_block=0 aFIw=c(nP
# if new ip blocked at this timeout run? #LN`X8Wz'
ever_block=0 .w ,q0<}
# reset wakeup_time 9Lfv^V0
wakeup_time=$wakeup_time_max G9vpt M
*k>n<p3dd
lasttime=`date +%s` sFTy(A/
RY*U"G0#w
while [ 1 ] f'3$9x
do rk )`\=No
curtime=`date +%s` y$R_.KbO
timediff=$((curtime-lasttime)) Mh
7DV
#echo "timediff: $timediff" -RK- Fu<e
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then 9k[9P;"F:
lasttime=$curtime n@[O| ?S
ever_block=0 `x%>8/
dotimeout zs#@j v$
fi &XUiKnNW
docheckall >~+ELVB&
mylogger_info "sleep for $wakeup_time""s" K )k<Rh[<
sleep $wakeup_time t9IW/Q
done U_c*6CK
yyy|Pw4:Z
&~U ]~;@
('p 5:d
1. 说明 R0
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， {3vNPQJ
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 0%I=d
该程序可以同时保护多个端口 ,U dVNA
Y% 5eZ=z
2. 安装 jsi!fx2Rm
tar zxf firewall-1.0b.tar.gz w_u\sSQ`!
cd firewall-1.0b
kX2rp?{
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh YLn?.sV{[0
}U5yQ%N
3. 配置 UU0,!?o4
主要配置项目如下： x{ WD;$J
# 最小检查周期，缺省为120秒 fPW @{~t
wakeup_time_min=120 -_eLf# 3
mU F,@>o
# 最大检查周期，缺省为300秒 <B8!.|19
wakeup_time_max=600 K:30_l<
@/-\k*T
# 重设防火墙状态的时间，缺省为3600秒 fNZ__gO
!%
rule_timeout=3600 !ff&W1@
RF0Hj gP
# 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) =
6\^%
# 一般的网络攻击都是针对80和25，又以80居多 o`N 9!M
portlist="80 25" 6a r
c. F6~IHu7
# 每个ip可占用的最大活动（Established）连接数 s( q_
o
max_active_conn=8 &m:uO^
-D
I,@6J(9
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 .gOL1`b*
# 如果用的是ipchains，可以忽略此项 aM 0f/"-_
iptables_chain_name="RH-Lokkit-0-50-INPUT" ~|xA4u5LG
u.Tcg^v
# 日志输出目标 yFlm[K5YD
log_facility="local0"
oc0G |
PGV/ h
**** 关于检查周期 **** oJ|j#+Ft
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 eb" 5-
0
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。 ptxbDzOz
bTs?!~q
**** ipchains vs iptables **** %
0+j?>#X
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 !L N?PKJ
/etc/sysconfig/iptables都没有检测到，则报错退出。 g:Xhw$x9
ls:w8 &`*
**** 日志输出 **** p /@smke
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 p\aaJ
中加入一条： mg.kr :
local0.* /var/log/firewall.log G`BU=Fi
然后重新启动syslog ia E^a^*
/etc/init.d/syslog restart ktBj|-'>
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 @Y<bwv
x%!s:LVX
4. 运行 c*L\_Vx+
/usr/prima/sbin/firewall.sh & EkNunCls
jeH~<t{
范例输出： (~wqa 3
*** firewall.sh v1.0b ValueOf.com*** g+>( dnX
Firewall is: ipchains };jN\x?&q
Port protected: 80 25 e MY<uqdw
Max connection per ip: 8 x QXXC
|T
Min time to check: 120s RA'M8: $
Max time to check: 300s >$7 v
;Q
Timeout circle: 3600s > A"v ed8
Output is logged to: local0 T)TfB (
?6un4EVL{
察看/var/log/firewall.log，可以看到： ^!ZC?h!rG
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 J1I ;Jgql(
Oct 16 14:08:55 server firewall.sh: 192.168.0.60 2 connections // 有两个来自192.168.0.60的连接 p#?7 w
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 : f}9($
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 +|'c>,?2H
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 W~~7 C,!
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 W=
Mb
6S*e xw
5. 停止 B9$ jSD
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 }v *G_}^
# ps auxww|grep firewall.sh o9%)D<4M
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh w2Jf^pR
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh ~yfNxH~k
第一行即firewall.sh的进程，用kill命令： hj B@o#S
# kill 27932 "UG
Y2skf;
[1] Terminated /usr/prima/sbin/firewall.sh uK$9Ll{lk
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
