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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 r{Mn{1:
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#!/bin/sh E!L_"G
W
# this program is used to check tcp/ip connections <P]%{msGH
# and block those ip with excessive connections ::cI 4D
>>8{N)c5E
# my version nm %7 e!{m
myver="1.0RC1" M+lr [,c
]
U }B ~Y
# wake up every 120s if last check found abuse client b+$wx~ PLi
wakeup_time_min=120 <B @z>V
_|;{{8*?
# wake up every 300s if last check found no abuse client nFn}
wakeup_time_max=300 )/2TU]//
e ]{=#
# rule timeout 3600s .VohW=D3
rule_timeout=3600 QpS7 nGev
{*<%6?
# check port list tOo\s&
j
portlist="80" ([7XtG/?
z&jAS L
# max established connection per ip `-?`H>+OG
max_active_conn=8 ~4mRm!DP
7d+0'3%
# iptables chain name v0T?c53?
iptables_chain_name="RH-Lokkit-0-50-INPUT" <KE%|6oER
jBd=!4n
# log facility {j4&'=C:
log_facility="local0" O]@s` w
]c]^(
C
# Block policy Zt9l d=T
ipchains_block_policy="DENY" ]]y,FQ,r
iptables_block_policy="REJECT" ?>gr9w\
;3%Y@FS@
# myself vjA!+_I6
myself=`basename $0` Tz
0XBH_
(.5
Ft^3W
mylogger_info() Q9;
VSF)
{ *<}R=X .
logger -p $log_facility.info -t $myself $@ 2>/dev/null [ /<kPi
} &MB1'~Q,hq
bkrl>Im<n
mylogger_debug() CdtCxy5
{ ,F+,A].wG
logger -p $log_facility.debug -t $myself $@ 2>/dev/null j9-.bGtm?.
} =F5 zU5`i
1 qp"D_h
mylogger_notice() v] m`rV8S[
{ $I<\Yuy-M9
logger -p $log_facility.notice -t $myself $@ 2>/dev/null yQ&C]{>TS
} *qxv"PptX
*?>52 -&b
dotimeout() ,vBB". LY'
{ !P":z0K4
mylogger_info "reset firewall when timeout arrives" K~fWZT3]
case "$firewall" in
st >%U9
ipchains) 5v sn'=yN
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null V >~\~H2Y
if [ $? = 0 ] ; then Z|A+\#'
mylogger_info "ipchains restarted" p<y \ ^a
else i?|u$[^=+
mylogger_notice "ipchains restart failed" = GiN~$d
fi aY DM)b}
;; }C$D-fH8sW
iptables) J<&?Hb*|
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null ):n'B` f}z
if [ $? = 0 ] ; then zhY] !
mylogger_info "iptables restarted" .\3gb6S
}
else DU-dIq i
mylogger_notice "iptables restart failed" (? i4P5s[!
fi s%A?B 8,
;; 1 4(ct
*) x Vw1
mylogger_notice "neither ipchains nor iptables" |;"(C# B
;; O>9-iqP>`d
esac k4` %.;
we
kb&?
} 48{B} j%oU
y!|4]/G]?t
blockclient() //bQD>NBO
{ di<g" 8
if [ -z "$1" ] || [ -z "$2" ]; then :*cd$s
mylogger_notice "blockclient() missing client or port to block" []?*}o5&>T
return Ml )<4@
fi o ?aF
local ip port FMitIM*]
7324#Hw S
ip=$1 om6`>I*
port=$2 Gc;-zq
f*^bV_
case "$firewall" in Ix0#eo j
ipchains) =!/T4Oo
mylogger_notice "blocking $1 to $2 via ipchains" +^.xLTX`$
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` Q v},X~^R
if [ -z "$found" ] ; then v7D0E[)~
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" BU|m{YZ$
mylogger_debug "cmd: $cmd" {& FOa'bP
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` < t"fL
RX
if [ $? != 0 ] ; then nd5.Py$
mylogger_notice "$cmd call failed" sBNqg~HwB?
return <d{>[R)
fi zY ].Z S=7
new_block=1 YDgG2hT/2
ever_block=1 'yh)6mid
else %iZ~RTY6 !
mylogger_info "$ip already blocked to $port" P7 5@Yu(
fi dd4^4 X`j
;; TnuA uui*
iptables) {9~3y2:
mylogger_notice "blocking $1 to $2 via iptables" ,,?X Gx
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` .{(gku>g(
if [ -z "$found" ] ; then kAW 2vh
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" .EjjCE/v-
mylogger_debug "cmd: $cmd" zXe]P(p<
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` qR4-~ p 8
if [ $? != 0 ] ; then eXkpU7w;
mylogger_notice "$cmd call failed" &7eN
EA
return /KlSI<T@
fi oF s )UR
new_block=1 ~e5E%bXxC
ever_block=1 /5Yl, P
else S4!B;,?AxN
mylogger_info "$ip already blocked to $port" WHRBYq_
fi O81'i2M J9
;; <V|\yH 9
*) f2 ck=3
mylogger_notice "neither ipchains nor iptables" bc2S?u{
;; P R_|
8H|
esac j% '~l#nw
} Uu|R]azbO
Zy>y7O(,
restartservice() sDkO!P
{ =b Q\BY#
local service o9Tsyjbj
if [ -z "$1" ] ; then 1Q$/L+uJ5
mylogger_notice "no port given to see which service to be restart" 6Zv-kG
return = @ 1{LF;
fi =r~ExW}+
>{"E~U
case "$1" in Uf|@h
80) 2Xv$
service="httpd" t]ID
;; k
jx<;##R8
25) 7<LCX{Uw
service="postfix" tl = e!
;;
$qiM_06
110) 2
yRUw
service="courier-pop3d" 'lOpoWD L
;; _I0=a @3
21) n -x
Caq
service="muddleftpd" Pt/F$A{Cj
;; )vG xF}I3
53) perhR!#J
service="named" D*g
K, `
;; : bq UA(k
3306) ,9$| "e&
service="mysqld" <lRjh7
;; GGsAisF"N
esac
4G j
if [ ! -z "$service" ] ; then CxrsP.
/etc/init.d/$service restart 1>/dev/null 2>/dev/null #`%V/ #YK
if [ $? = 0 ] ; then 3.h0
mylogger_notice "$service restarted" X#ud_+6x
else %kuUQ %W1
mylogger_notice "$service restart failed" _lfS"ae
fi cvjZ$Fcc%(
fi 8`Tj *7Y=
} pV$A?b"?*
)g ?'Nz
docheckport() -gv[u ,R
{ PVrNS7 Rk/
mylogger_info "do check port $1" /m K]O7O7
local port last_client count client total_count }&^1")2t
Y 0ACJ?|
if [ -z "$1" ] ; then QiNLE'19^
mylogger_notice "docheckport() port not given" CW,|l0i
return "j=E8Dd}
fi YOUX
H5be 5
port=$1 .G >~xm0
b\H,+|i K
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` \\Nt^j3qR
if [ $? != 0 ] ; then J5}?<Dd:
mylogger_notice "netstat call failed" %:7/ym[
return h3Nbgxa.
fi 0" i QH i
#echo $clientlist 0SJ(Ln`0K
# reset new_block 9 } ]C
new_block=0 v 1 f^gde
count=0 <@;bxSUx
total_count=0 ;.7]zn.X]2
last_client="" Iz&<rL;s
for client in $clientlist (m x}6A
do G_xql_QR
#echo "client is $client" # /)U0 IR)
if [ -z "$last_client" ] ; then %< Jj[F
count=$((count+1)) /.(F\2+A
total_count=$((total_count+1)) )Zrn?K M
last_client=$client #2%8@?_-M
else p K)!o
if [ "$client" = "$last_client" ] ; then F`o"t]AD-a
count=$((count+1)) I3 YSW
total_count=$((total_count+1)) th+LScOX
else hj p,v)#
mylogger_debug "$last_client $count connections" cZAf?,>u
if [ $count -ge $max_active_conn ] ; then +KIFLuL
mylogger_notice "client $last_client connection $count >= $max_active_conn" L"(
{6H
blockclient $last_client $port {Vf].l:kn
fi I1JF2 " {c
count=1 \Lm`j U(:l
total_count=$((total_count+1)) HcHwvf6y
last_client=$client O*c<m,
fi / & yc?Ui
fi OOzXA%<%c
done B%z+\<3^q
# check the last client 5PE}3he:
if [ ! -z "$client" ] ; then |^gnT`+
count=$((count+1)) 5]2 p>%G
total_count=$((total_count+1)) I~,b ZA
mylogger_debug "$client $count connections" 6Z{(.' Be
if [ $count -ge $max_active_conn ] ; then L!~ap
mylogger_notice "client $client connection $count >= $max_active_conn" !'a
<Dw5
blockclient $client $port Sea 6xGdq
fi {X-a6OQj
fi !'> ,37()
mylogger_info "total connections on port $port: $total_count" $rPQ%2eF4
p,7?rI\ N
if [ $new_block = 1 ] ; then WpC9(AX5g
restartservice $port }bnodb^.7
fi Xi!e=5&Pa
} 6ck%M#v
]6,D 9^{;
docheckall() >C` #4e?}
{ jwhe
J G
# reset wakeup_time n'!x"O7
wakeup_time=$wakeup_time_max >
".@;
for port in $portlist 0+A MN-
do z</^q y
docheckport $port FhQb9\g
if [ $new_block = 1 ] ; then X#o;`QM
# set wakeup_time shorter cause we found some abuse client vILgM\or
wakeup_time=$wakeup_time_min l/A! ofc#)
fi W?n/>DML
done uFFC. w
} chM-YuN|
6xu%M&h
t
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then oslj <
firewall="ipchains" im
F,8 '
fi ]hZk #rp }
D[{"]=-
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then olK*uD'`
firewall="iptables" Bk5 ft4v-
fi Q+Eqaz`
^cu H\&&7
if [ -z "$firewall" ] ; then "tu*(>'~5
echo "Error: This machine does not have ipchains or iptables firewall support" Ii>#9>!F
exit 1 S`vw<u4t
fi .GWN~iR(
M{p9b E[j
mylogger_info "firewall.sh v$myver ValueOf.com starting" ""h%RhcZ\
mylogger_info "Firewall is: $firewall" ^Zlbs
goZ
mylogger_info "Port protected: $portlist" qipS`:TER
mylogger_info "Max connection per ip: $max_active_conn" rym*W\A Wx
mylogger_info "Min time to check: $wakeup_time_min""s" C}\kp0mz
mylogger_info "Max time to check: $wakeup_time_max""s" _:JV-lM
mylogger_info "Timeout circle: $rule_timeout""s" 1 K]
mylogger_info "Output is logged to: $log_facility" 0UQ
DB5u
l I2UpfkBP
# if new ip blocked at this check run? %m$t'?
new_block=0
,/[1hhP@
# if new ip blocked at this timeout run? x[$ : ^5V
ever_block=0 i'}"5O+
# reset wakeup_time A$?o3--#]G
wakeup_time=$wakeup_time_max fqn;,!D?9
WrR8TYq9D]
lasttime=`date +%s` 7 *4i0{ ]
x( rl|o
while [ 1 ] !X =93%
do
oOGFg3X
curtime=`date +%s` Z-a B[hE
timediff=$((curtime-lasttime)) :kXxxS
#echo "timediff: $timediff" .iST!n h
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then YW"nPZNPy~
lasttime=$curtime 'f6!a5q C
ever_block=0 4n% |h-!8
dotimeout )XYCr<s2"
fi l
Ng)k1
docheckall RMAbu*D 0
mylogger_info "sleep for $wakeup_time""s"
z@2n re
sleep $wakeup_time M*F`s& vM
done $ccCI
\
UQjZhH
$EZr@ n
^_o:Ddz?l"
1. 说明 !1P<A1K
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， KzB9
mMrO
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 W}k)5<C4v
该程序可以同时保护多个端口 'he&h4fm
_61tE
2. 安装 I5g!c|#y
tar zxf firewall-1.0b.tar.gz
--TY[b
cd firewall-1.0b x%RE3J-
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh #F+b^WT R
Y+3 r{OI
3. 配置 F/D/1w^ iR
主要配置项目如下： xGX U7w:X
# 最小检查周期，缺省为120秒 u~27\oj,
wakeup_time_min=120 8uB6C0 ,6?
h8HA^><Xr
# 最大检查周期，缺省为300秒 lUHpGr|U%
wakeup_time_max=600 !(qaudX{>k
k7bfgb
{
# 重设防火墙状态的时间，缺省为3600秒 200Fd8Ju
rule_timeout=3600 0,m@B sK
vrXNa8,L
# 保护的端口列表，缺省为80和25，支持的其他端口包括21(ftp), 110(pop3), 53(named), 3306(mysql) m[& pR2T
# 一般的网络攻击都是针对80和25，又以80居多 ,in"
8aT}~
portlist="80 25" Qs\!Kk@
gOn^}%4.I
# 每个ip可占用的最大活动（Established）连接数 v ce1'aW
max_active_conn=8
Ndqhc
3?yq*uE}
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 c +]5[6
# 如果用的是ipchains，可以忽略此项 <>[]- Vq
iptables_chain_name="RH-Lokkit-0-50-INPUT" 4CioVQdj
08;t% [R
# 日志输出目标 <@H=XEn
log_facility="local0" AO^c=^
j*@EJ"Gm>
**** 关于检查周期 **** m *H6\on:
程序定义了两个检查周期，如果上次检查中屏蔽了某个IP，则程序会更频繁地检查连接情况，反之则等待更长时间。通过检查周期 mX
QVL.P\
的动态调整，可以有效调度在遭受攻击和正常状态下程序的运行次数。 W8s/ "
Ih5F\eM
**** ipchains vs iptables **** /mFa*~dj2
目前该程序支持ipchains和iptables两种软件防火墙，使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 vhu5w#]u*
/etc/sysconfig/iptables都没有检测到，则报错退出。 5SmgE2 }
9N{"ob
Z
**** 日志输出 **** a gxR
V
程序的输出信息记录在系统日志中，目标是local0。如果没有特殊配置，可以在/var/log/messages中看到。建议在/etc/syslog.conf YNWAef4
中加入一条： FVS@z5A8<=
local0.* /var/log/firewall.log nV+]jQ~o
然后重新启动syslog "ku ?A ^f
/etc/init.d/syslog restart 'G d s?o8
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 %4HpTx
!Typ _Cs
4. 运行 0` l(c
/usr/prima/sbin/firewall.sh & k=qb YGK
F
B7.b
范例输出： {pW(@4U
*** firewall.sh v1.0b ValueOf.com*** [P?.( *
Firewall is: ipchains [X|KXlNfm
Port protected: 80 25 ~
J,e^$u
Max connection per ip: 8
[EU \-
Min time to check: 120s L ;s,x V
Max time to check: 300s -R-|[xN
Timeout circle: 3600s b".e6zev
Output is logged to: local0 A('_.J=
fA>FU/ r
察看/var/log/firewall.log，可以看到： j9Y'HU5"
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 \@i4im@%xU
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 4Sxt<7[f
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 />\6_kT
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 >*aqYNft
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 A #P]| i
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 4(FEfde=
96$qH{]Ap
5. 停止 m=uW:
~
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 t*'U|K4L/
# ps auxww|grep firewall.sh 8bIwRVA2\
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh ayvH
S&h
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh wkwsBi
第一行即firewall.sh的进程，用kill命令： &^4 E )F
# kill 27932 CnA0
^JX
[1] Terminated /usr/prima/sbin/firewall.sh {v >orP?
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
