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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 ,f%4xXI
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#!/bin/sh 7[ n
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# this program is used to check tcp/ip connections mS}.?[d"
# and block those ip with excessive connections ]2ab~
gr
cSv; HN:
# my version OI0@lSAo
<
myver="1.0RC1" w('}QB`xad
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# wake up every 120s if last check found abuse client -1hCi !
wakeup_time_min=120 ^N^s|
c'
NZG
^B/
# wake up every 300s if last check found no abuse client N2|NYDQs
wakeup_time_max=300 QxbG-B^)=
PYNY1
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# rule timeout 3600s M%$ITE
rule_timeout=3600 uwi.Sg11
.i )n1
# check port list YADXXQ"
portlist="80" ,dosF Q
* >:<
# max established connection per ip hAds15 %C
max_active_conn=8 x
1
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RkTYvAk|kY
# iptables chain name x
<aR |r
iptables_chain_name="RH-Lokkit-0-50-INPUT" e NH9`Aa
uK#
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# log facility Gf+X<a
log_facility="local0" ?I+$KjE +
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c t
# Block policy G pO*As_2
ipchains_block_policy="DENY" 1A *
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iptables_block_policy="REJECT" R?#=^ $7U
G
JU9[
# myself 9; 9ge
myself=`basename $0` E{^W-
e7-IqQA{3C
mylogger_info() Ek_<2!%X
{ +!:=Mm
logger -p $log_facility.info -t $myself $@ 2>/dev/null /C <p^#g9.
} WWOt>C~zV
%<p/s ;eu
mylogger_debug() QUZ+#*:s
{ iweT @ P`
logger -p $log_facility.debug -t $myself $@ 2>/dev/null RE D@|[Qh
} #, 1)@[
rz`"$g+#
mylogger_notice() x&+&)d
{ qUn+1.[%
logger -p $log_facility.notice -t $myself $@ 2>/dev/null r1}1lJ>7H
} 2 J3/Eu
\~Ml<3Zd:
dotimeout() CvEIcm=t
{ .wlKl[lE2
mylogger_info "reset firewall when timeout arrives" s%>8y\MaK
case "$firewall" in q"S,<I<f
ipchains)
B[#n,ay
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null 3J/l>1[
if [ $? = 0 ] ; then cW"DDm
g
mylogger_info "ipchains restarted" hd(TKFL^y
else }s6Veosl
mylogger_notice "ipchains restart failed" vM$hCV ~N
fi 8$Zwk7 w8A
;; =w"Kkj>%oh
iptables) <%rm?;PBl
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null 7xux%:BN
if [ $? = 0 ] ; then /EegP@[
mylogger_info "iptables restarted" ro3%VA= V
else L
8;H_:~_'
mylogger_notice "iptables restart failed" dV}]\ 8N
fi xdz 6[8 d8
;;
yl S6D
*) )^"V}z
t
mylogger_notice "neither ipchains nor iptables" gX(Xj@=(&
;; WSv%Rxr8L
esac /(u? k%Q
'iOa j0f
} & 5z9C=]e
![fNlG!r
blockclient() @#-\ BQ;
{ i: jB
if [ -z "$1" ] || [ -z "$2" ]; then njO~^Hl7
mylogger_notice "blockclient() missing client or port to block" .}Ys+d1b9c
return X Z3fWcw [
fi Ht/#d6cQ
local ip port R
?/xH=u>
cR,'aX
ip=$1 7'Hh^0<
port=$2 gu ~R4 @3
}aI>dHL
case "$firewall" in 6BEpnw>p(
ipchains) W=LJhCpRHj
mylogger_notice "blocking $1 to $2 via ipchains" 11 Qi
_T\
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` .X"&k O>G
if [ -z "$found" ] ; then b
!Nr
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" ST~YO
mylogger_debug "cmd: $cmd" %hw4IcWJ|
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` B afNF Pc
if [ $? != 0 ] ; then V"2 G
mylogger_notice "$cmd call failed" 5K682+^5
return :D;pD l
fi f\Hw Y)^>
new_block=1 ,O:p`"3`0=
ever_block=1 m|x_++3
else yV(9@lj3;
mylogger_info "$ip already blocked to $port" 7+@-mJMP$D
fi L:mE)Xq2
;; Kb;Pd!Q
iptables) r&+C %
mylogger_notice "blocking $1 to $2 via iptables" I|K!hQ"m
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` * 8;< w~
if [ -z "$found" ] ; then zSk`Ou8M
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" MtF0/aT
mylogger_debug "cmd: $cmd" qwnVtD
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` bwP@ }(K
if [ $? != 0 ] ; then ) R5j?6}xF
mylogger_notice "$cmd call failed" tlg}"lY
return uTPAf^|
fi `,/5skeJ
new_block=1 !O }e)t
ever_block=1 c9Cc%EK
else
k $ 8Zg*)
mylogger_info "$ip already blocked to $port" 02%~HBS
fi OT=1doDp
;; )p> p3b g
*) @p^E Xc*|
mylogger_notice "neither ipchains nor iptables" QJi
H^KY6
;; :V#xrH8R
esac :"Tkl$@,
} u;1[_ ~
M2d&7> N
restartservice() Ex*{iJ;\
{ u8| CeA
local service Qy4Pw\
if [ -z "$1" ] ; then ][V`ym-e
mylogger_notice "no port given to see which service to be restart" pr4y*!|Y$
return q(hBqU W
fi oTXIs4+G
(f_J @n
case "$1" in v''J@ F7
80) c'Ibgfx%m
service="httpd" T3S
F G]H
;; /?XI,#j3kM
25)
L 2}<2
service="postfix" F]>+pU
;; + |pYu<OY
110) rL mc(-q
service="courier-pop3d" ]>k8v6*=
;; #<sK3 PT
21) y x#ub-A8
service="muddleftpd" h?B1Emlq
;; ;XjX v'
53) ~Jw84U {$
service="named" gE=9K @
;; >py[g0J
3306) RIO?rt;
service="mysqld" l.Ev]G/5
;; O#O" ]A
esac 7w8 UnPuM
if [ ! -z "$service" ] ; then Ef ?|0Gm
/etc/init.d/$service restart 1>/dev/null 2>/dev/null ;
2V$ `k
if [ $? = 0 ] ; then YN
<vOv
mylogger_notice "$service restarted" Gx}`_[-
else &V+KM"Ow
mylogger_notice "$service restart failed" T:
2f*!r
fi ? K2}<H-
fi QUvSeNS
p
} #9.%>1{6Y
:Mh\;e
docheckport() +_bxza(ma{
{ z#P`m,~t0
mylogger_info "do check port $1" k\j_hu
local port last_client count client total_count 5/h-H r
&HAu;u@
if [ -z "$1" ] ; then ^ACrWk~UY
mylogger_notice "docheckport() port not given" |s(Ih_Zn
return IhZn
fi mXS] SE
3RvD
X p
port=$1 zb"4_L@m2
3tJfh=r=1
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` !.t D.(XP
if [ $? != 0 ] ; then rKFnivGT
mylogger_notice "netstat call failed" $U 9]v5
return Z[] 8X@IPe
fi Um z b
#echo $clientlist ^ E8qI8s
# reset new_block ]$9y 7Bhj.
new_block=0 ? nbu`K6T
count=0 .`*]nN{
total_count=0 oD\t4]?E
last_client="" =H;'.!77Hx
for client in $clientlist v@q&B|0
do |W=-/~X
#echo "client is $client" + l
VA$]d
if [ -z "$last_client" ] ; then oPni4^g i
count=$((count+1)) }+pwSjsno
total_count=$((total_count+1)) s2|.LmC3|B
last_client=$client /^k%s G@?
else 1;S?9N_B
if [ "$client" = "$last_client" ] ; then m;>G]Sbe
count=$((count+1)) ) `'a1y|
total_count=$((total_count+1)) P!IA; i
else 6D2ot&5WW
mylogger_debug "$last_client $count connections" PlS)Zv
3
if [ $count -ge $max_active_conn ] ; then 0#8, (6
mylogger_notice "client $last_client connection $count >= $max_active_conn" :Rv+Bm
blockclient $last_client $port h^Yh~84T
fi
\aM-m :J
count=1 #\^=3A|b
total_count=$((total_count+1)) ' /6f2[%Y"
last_client=$client Wex2Fd?DO
fi Y,}h{*9Kd
fi quaRVD>s +
done {^N,$,Ab.
# check the last client &g23tT#P?
if [ ! -z "$client" ] ; then 71P. 9Iz
count=$((count+1)) 0)b1'xt',
total_count=$((total_count+1)) er-0
i L@
mylogger_debug "$client $count connections" K39I j_3
if [ $count -ge $max_active_conn ] ; then 2}/r>]9^-
mylogger_notice "client $client connection $count >= $max_active_conn" p=> +3
blockclient $client $port O{\<Izm`D
fi uuF~+=.|
fi =EA @
mylogger_info "total connections on port $port: $total_count" c7@/<*E+
}wv R s5;o
if [ $new_block = 1 ] ; then SIR2 Kc0
restartservice $port MoE h25U.
fi *? uUP
} MMET^SO
n[K%X s)
docheckall() -]u>kjiIT
{ u #} 1
M
# reset wakeup_time v*JKLA
wakeup_time=$wakeup_time_max H\<0{#F
for port in $portlist #<m2Xo?d]
do 2|RoN)%
docheckport $port I/A%3i=H
if [ $new_block = 1 ] ; then !- QB>`7$
# set wakeup_time shorter cause we found some abuse client S\t!7Xs%*U
wakeup_time=$wakeup_time_min #EE<MKka
fi :]Om4Q\-#
done z~p!7q&g
} yW7>5r
30Qp:_D
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then Th\T$T`X$
firewall="ipchains" d*k5h<jM
fi &LB`
2Y[n
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then -p7
H Q/
firewall="iptables" oPbzi B8
fi edlf++r~
\' A-
Lp
if [ -z "$firewall" ] ; then R! X+-
echo "Error: This machine does not have ipchains or iptables firewall support" &%/T4$'+Y+
exit 1 G
O G[^T
fi jll| y0
(0_zp`)
mylogger_info "firewall.sh v$myver ValueOf.com starting" b~)2 `l
mylogger_info "Firewall is: $firewall" c`lL&*]
mylogger_info "Port protected: $portlist" Wk/Q~ o
mylogger_info "Max connection per ip: $max_active_conn" 7o!t/WEEq
mylogger_info "Min time to check: $wakeup_time_min""s" BAi0w{
mylogger_info "Max time to check: $wakeup_time_max""s" 5K$<Ad4$b
mylogger_info "Timeout circle: $rule_timeout""s" <W7WlT
mylogger_info "Output is logged to: $log_facility" .V_5q:tu
b~YIaD[Z
# if new ip blocked at this check run? Z }>;@c
new_block=0 G6x 'Myg I
# if new ip blocked at this timeout run? |_+l D|'
ever_block=0 #a
tL2(wJ
# reset wakeup_time 4N7|LxNNl_
wakeup_time=$wakeup_time_max swJ QwY
=kK%,Mr
lasttime=`date +%s` dShGIH?
UFj!7gX ]
while [ 1 ] ,TB$D]u8
do Au (o Ks<
curtime=`date +%s` #67 7,dn
timediff=$((curtime-lasttime)) +/ M%%:>mY
#echo "timediff: $timediff" d(b~s2\i
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then n
3-VqYUP
lasttime=$curtime S>j. i
ever_block=0 |}<Gz+E>
dotimeout SdnO#J}{
fi <nN# K{AH
docheckall "oF)u1_?
mylogger_info "sleep for $wakeup_time""s" O;}K7rSc
sleep $wakeup_time JB. U&
done ]0|A\bE\S
B/!/2x
fYh <S
?Drq!?3PDc
1. 说明 vE GI
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， x#R6Ez7
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。 Un
T\6u
该程序可以同时保护多个端口 :rjfAe=s
iXvrZofE
2. 安装 x)eoz2E1
tar zxf firewall-1.0b.tar.gz jcBZ#|B7;
cd firewall-1.0b wQ@:0GJH
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh Ec iu^
M:iH7K
3. 配置 WBm)Q#1 :
主要配置项目如下： 'U0 W
# 最小检查周期，缺省为120秒 =]/<Kd}A.
wakeup_time_min=120 0 ]L
qc\D=3 #Yp
# 最大检查周期，缺省为300秒 uI%7jA~@
wakeup_time_max=600 ;YW@ 3F-h
lCl5#L9
# 重设防火墙状态的时间，缺省为3600秒 g%!U7CM6h
rule_timeout=3600 [ K'gv Lt1
P +OS
# 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) $60`Hh 4/
# 一般的网络攻击都是针对80和25，又以80居多 gw[Eu >I
portlist="80 25" ,u)jZ7
BOq9\g`5s
# 每个ip可占用的最大活动（Established）连接数 %b4tyX:N0
max_active_conn=8 (K84J*;
: T7(sf*!*
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 Qx8(w"k*
# 如果用的是ipchains，可以忽略此项 p :W ]
iptables_chain_name="RH-Lokkit-0-50-INPUT" v}d)uPl} ;
6y MZ2%
# 日志输出目标 =y )K er
log_facility="local0" 4nh=Dq[
1
ptyiy
**** 关于检查周期 **** ZILJXX4
程序定义了两个检查周期，如果上次检查中屏蔽了某个IP，则程序会更频繁地检查连接情况，反之则等待更长时间。通过检查周期 ~QxW^DGa7]
的动态调整，可以有效调度在遭受攻击和正常状态下程序的运行次数。 pq&[cA_w
IM/xBP
**** ipchains vs iptables **** W{tZX ^|
目前该程序支持ipchains和iptables两种软件防火墙，使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 i$P O#}
/etc/sysconfig/iptables都没有检测到，则报错退出。 ljOY;WV3
Rb& 9!z
**** 日志输出 **** ; teM^zyI
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 VwPoQ9pIS
中加入一条： %< (d %&~
local0.* /var/log/firewall.log 8B?U\cfa^
然后重新启动syslog h@G~' \8 t
/etc/init.d/syslog restart tO:JB&vO2
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 OoH-E.lp
!3 Pmjip
4. 运行 ?{ ^_z_,
/usr/prima/sbin/firewall.sh & 2HN*j~>i~
a {hc{
范例输出： Q+9:]Bt
*** firewall.sh v1.0b ValueOf.com*** D_czUM
Firewall is: ipchains :ZIa
Port protected: 80 25 ?{B5gaU9F
Max connection per ip: 8 ?<C(ga
Min time to check: 120s N\g=9o|Q
Max time to check: 300s DlE, aYB
Timeout circle: 3600s n f 8V:y4
Output is logged to: local0 6Uk+a=Ar
5 k3m"*
察看/var/log/firewall.log，可以看到： J~]@#=,v
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 ^ ?+[yvq
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 Rq5'=L
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 2RX]~}
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 EpMxq7*
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 /)Cfm1$ic
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 y2#>a8SRS
M
x#L|w`r
5. 停止 6Lq`zU^
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 _)
x{TnK
# ps auxww|grep firewall.sh ?o ;ip
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh #:gl+
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh zY_J7,0g
第一行即firewall.sh的进程，用kill命令： ` 5Kg [nB:
# kill 27932 L?d?O
[1] Terminated /usr/prima/sbin/firewall.sh ?Te#lp;`~
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
