deserts
 大客部
级别: 总版主
精华:
0
发帖: 607
威望: 2 点
金钱: 1061 RMB
贡献值: 0 点
在线时间:1761(小时)
注册时间:2006-01-01
最后登录:2025-10-20
|
linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 9JIL K9mVO
>f1fvv6
#!/bin/sh c] $$ap
# this program is used to check tcp/ip connections vI48*&]wTf
# and block those ip with excessive connections z?UEn#E2
gnb+i`
# my version J^ PFhu
myver="1.0RC1" z-sq9
Qp&x
'[_.mx|cd`
# wake up every 120s if last check found abuse client 9Gx`[{wI9<
wakeup_time_min=120 n 1^h;2gz
]xJ. OUJy
# wake up every 300s if last check found no abuse client 28- z
wakeup_time_max=300 NMrf I0tbG
2Ib
1D
# rule timeout 3600s l!\~T"-7;:
rule_timeout=3600 &Rz -;66bN
WK#%G
# check port list /{I-gjovy
portlist="80" 23Q 88z
REsw=P!b
# max established connection per ip A#i[Us|
max_active_conn=8 aQ &K a
&W `7 b<
# iptables chain name cveQ6
-`K
iptables_chain_name="RH-Lokkit-0-50-INPUT" =xSf-\F
.O&YdUo
# log facility 2 nL*^hhh
log_facility="local0" gieso f
jL'R4z
# Block policy l%2 gM7WMY
ipchains_block_policy="DENY" (W[]}k ;
iptables_block_policy="REJECT" rD !GEU
O+=}x]q*y
# myself B9c
gVTLj
myself=`basename $0` /o}i,i$
sx' eu;S
mylogger_info() PZ?kv 4
{ T&Z*=ShH
logger -p $log_facility.info -t $myself $@ 2>/dev/null .CW,Td3f!
} G %K&f1q%
q:vGG K^
mylogger_debug() )FfS7 C\.
{ vM:c70=
logger -p $log_facility.debug -t $myself $@ 2>/dev/null ^U,Dx
} u?'J1\z
~I~lb/
mylogger_notice() )Z\Zw ~L
{ b P V; "
logger -p $log_facility.notice -t $myself $@ 2>/dev/null #GUD^#Jh
} X[SI k%{D
\+x#aN\
dotimeout() 152LdZevF
{ 6(ER$
mylogger_info "reset firewall when timeout arrives" ]a[2QQ+g
case "$firewall" in z$M-U xY
ipchains) OAgZeK$
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null 1Cw$^jd
if [ $? = 0 ] ; then O2U }jHsd
mylogger_info "ipchains restarted" 0+.<BOcW5
else gQ<{NQMzvd
mylogger_notice "ipchains restart failed" wT-
K g=-q
fi
%CU wD
;; @![1W@J
iptables) 9`KFJx6D
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null !HeQMz
if [ $? = 0 ] ; then *uKYrs [
mylogger_info "iptables restarted" {]dvzoE
]
else _3#_6>=M
mylogger_notice "iptables restart failed" {xICR ~,*
fi vZ^U]h V
;; X0]$Ovq( l
*) 7`^=Ie%(K
mylogger_notice "neither ipchains nor iptables" <$C3]
=2
;; Tl+PRR6D*
esac 6 B7
F
J
gV4-B
0
} ZkNet>9
pOj8-r r
blockclient() S,a:H*Hf
{ +k0UVZZX?
if [ -z "$1" ] || [ -z "$2" ]; then <)"i' v $
mylogger_notice "blockclient() missing client or port to block" *qxv"PptX
return *?>52 -&b
fi czB),vooz
local ip port !P":z0K4
kjt(OFh'Y+
ip=$1
st >%U9
port=$2 NceK>:: 56
V >~\~H2Y
case "$firewall" in Z|A+\#'
ipchains) p<y \ ^a
mylogger_notice "blocking $1 to $2 via ipchains" i?|u$[^=+
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` ij.NSyk9
if [ -z "$found" ] ; then aY DM)b}
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" \FnR'ne
mylogger_debug "cmd: $cmd" e+?;Dc-SJ\
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` ;qcOcm%
if [ $? != 0 ] ; then zhY] !
mylogger_notice "$cmd call failed" NS "1zR+
return DU-dIq i
fi (? i4P5s[!
new_block=1 s%A?B 8,
ever_block=1 1 4(ct
else ?.c:k;j
mylogger_info "$ip already blocked to $port" =%B}8$.|
fi urQ<r{$x0
;; ` 9A`pC
iptables) #E#@6Zom T
mylogger_notice "blocking $1 to $2 via iptables" /PG%Y]l0b
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` anORoK.
if [ -z "$found" ] ; then }{[JS=A^
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" O@skd2
mylogger_debug "cmd: $cmd" biU
?>R
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` vorb? iVf>
if [ $? != 0 ] ; then a FL< (,~r
mylogger_notice "$cmd call failed" )"63g
return pezfB{x?
fi 7'ws: #pC
new_block=1 '"h}l`
ever_block=1 T ^ #1T$
else Ym $`EN
mylogger_info "$ip already blocked to $port" fe}RmnAC
fi 4I.)>+8V
;; ]jR-<l8I-
*) {#&D=7LP
mylogger_notice "neither ipchains nor iptables" J@J` )
;; c57`mOe/b
esac r>rL[`p(2
} ?DY6V;&F@f
2\F'So
restartservice() }T5 3y6J#
{ `*]r+J2
local service .m xc
~
if [ -z "$1" ] ; then C\ 3 4R
mylogger_notice "no port given to see which service to be restart" u5`b")a
return f3<253 1/}
fi }hXmK .['
V Y@` )
case "$1" in "M, Hm!j
80) drp< f1`l8
service="httpd" uTy00` 1
;; g$z6 *bL
25) $4]4G=o
service="postfix" \^lDd~MWG
;; hl,x|.f}4Y
110) 1TgD;qX
service="courier-pop3d" A'*#UYn(
;; cxIAI=JK
21) 0 n|>/i
service="muddleftpd" 1 =^
|
;; XF
i9qL^
53) w4RtIDW:
service="named" i1Y< [s
;;
)t,efg
3306) _iu^VK,}
service="mysqld" f2 ck=3
;; bc2S?u{
esac P R_|
8H|
if [ ! -z "$service" ] ; then B!J&=*=e
/etc/init.d/$service restart 1>/dev/null 2>/dev/null [6nN]U~ Y
if [ $? = 0 ] ; then g? C<@
mylogger_notice "$service restarted" DyRU$U
else o\nFSG kn
mylogger_notice "$service restart failed" }50s\H._C
fi z
AY
-Y
fi Q6CVMYT
} 8P}
a
n9k-OGJ
docheckport() ^,Ft7 JAn
{ > v4+@o[~
mylogger_info "do check port $1" D<T:UJ
local port last_client count client total_count ZD<e$PxxCd
3WPZZN<K9
if [ -z "$1" ] ; then {7E pljH@
mylogger_notice "docheckport() port not given" +_ $!9m
return Hr*xA x
fi @
b} -<~
>Xxi2V y
port=$1 dfXBgsc6i
4?c0r C <
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` $IJ"fs
if [ $? != 0 ] ; then xr31< 4B
mylogger_notice "netstat call failed" ".k
H5(:
return z uJ@@\75
fi $@~s
O0q
#echo $clientlist c7]0 >nU;
# reset new_block .cr<.Ov
new_block=0 $ou/ Fn
count=0 $NBQv6#:
total_count=0 QvlV jDIy
last_client="" j/1 f|x
for client in $clientlist (bD#PQXz m
do U XOf
#echo "client is $client" OZ&SxR%q4
if [ -z "$last_client" ] ; then u&e?3qKX(
count=$((count+1)) n9V 8A[QJ
total_count=$((total_count+1)) _D8:p>=
last_client=$client RG_6&
A
else !14 l[k+\
if [ "$client" = "$last_client" ] ; then P&*e\"{
count=$((count+1)) X*`b}
^T
total_count=$((total_count+1)) )!'7!" $
else dlwOmO'Bm)
mylogger_debug "$last_client $count connections" SOluTFxUw
if [ $count -ge $max_active_conn ] ; then so A] f
mylogger_notice "client $last_client connection $count >= $max_active_conn" b6@0?_n
blockclient $last_client $port K"Gea`I
fi $v=(` =
count=1 <,J O
total_count=$((total_count+1)) [+qB^6I+P%
last_client=$client sRflabl *x
fi SGpe \P ]k
fi &H2j3De
done 22 `e7
# check the last client DK|/|C}6
if [ ! -z "$client" ] ; then 8Y;2.Z`Rz
count=$((count+1)) '~x iD?:
total_count=$((total_count+1)) kE1k@h#/
mylogger_debug "$client $count connections" )2R]KU_=g
if [ $count -ge $max_active_conn ] ; then ix 5\Y
mylogger_notice "client $client connection $count >= $max_active_conn" vX$|/74
blockclient $client $port W 2A!BaH%
fi )9+H[
fi pe
VzF'F
mylogger_info "total connections on port $port: $total_count" r<'B\.#tp>
+xNq8yS
if [ $new_block = 1 ] ; then u89Q2\z~"M
restartservice $port 'i 8`LPQ
fi +l<;?yk:;
} %
xBQX
;>Z0e`=
docheckall() TU9$5l/;g
{ K\5/ ||gi
# reset wakeup_time m21H68y
wakeup_time=$wakeup_time_max b>nwX9Y/U
for port in $portlist _"82W^W i
do ]F"@+_E
docheckport $port xxpzz(S ]A
if [ $new_block = 1 ] ; then m A5sK?W
# set wakeup_time shorter cause we found some abuse client "f-HOd\=
wakeup_time=$wakeup_time_min vP,$S^7$
fi l@ >@2CB
done 8 LsJ}c
} RF'&.RtVa
H )Ze{N
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then ,j eC7-tX
firewall="ipchains" m5cRHo<9Y
fi % ejq|i7
<6C :\{eo
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then %t]{C06w+{
firewall="iptables" Ce} m_
fi LB^xdMXi
jH37{S-
if [ -z "$firewall" ] ; then [NbW"Y7
echo "Error: This machine does not have ipchains or iptables firewall support" >txeo17Ba\
exit 1 %. ;;itB
fi }w{E< C(M
dyl1~'K^
mylogger_info "firewall.sh v$myver ValueOf.com starting" yn.[-
mylogger_info "Firewall is: $firewall" X5+$:jq&
mylogger_info "Port protected: $portlist" ,vuC 0{C^
mylogger_info "Max connection per ip: $max_active_conn" @I?: x4
mylogger_info "Min time to check: $wakeup_time_min""s" ~gg&G~ ET
mylogger_info "Max time to check: $wakeup_time_max""s" =0SJf 3
mylogger_info "Timeout circle: $rule_timeout""s" uS! V_]
mylogger_info "Output is logged to: $log_facility" *O7PH1G
3Qu-X\
# if new ip blocked at this check run? sk@aOv'*(
new_block=0 nY,L Q0r
# if new ip blocked at this timeout run? P[r$KGz
ever_block=0 \ZBz]r h*
# reset wakeup_time _AH_<Z(
wakeup_time=$wakeup_time_max So4# n7
kkXe= f%
lasttime=`date +%s` gwFW+*h
OXbC\^qo@
while [ 1 ] N:,V{Pw
do UI*&@!%bzp
curtime=`date +%s` bb$1zSA
timediff=$((curtime-lasttime)) ,Qj\_vr@
#echo "timediff: $timediff" >S%}HSPKq
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then !p_l(@f
lasttime=$curtime =nlj|S ~3
ever_block=0 /'^ BH A|h
dotimeout W!1
B~NH#
fi }d@;]cps
docheckall aj-:JTf
mylogger_info "sleep for $wakeup_time""s" Hio+ k^
sleep $wakeup_time S(lqj6aa}
done qBZ ;S3
m; PTO$--
1+Vei<H$
tZ:f
OM
1. 说明 .:tR*Kst`7
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， wd1>L) T
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。 ^[v>B@p* {
该程序可以同时保护多个端口 ! "' @c
l>)+Ho D
2. 安装 2
S2;LB
tar zxf firewall-1.0b.tar.gz Ld=6'C8ud
cd firewall-1.0b )2r_EO@3HP
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh VYrs4IFT$
HN<
e)E38
3. 配置 >uE<-klv
主要配置项目如下： >Fc=F#tA9
# 最小检查周期，缺省为120秒 8qT^= K
$
wakeup_time_min=120 u Npa2{S'
mOb@w/f
# 最大检查周期，缺省为300秒 qnO/4\qq
wakeup_time_max=600 OGW0lnQ/
~)5k%?.
# 重设防火墙状态的时间，缺省为3600秒 z
hU^~4F
rule_timeout=3600 >j c17BJq
%}{.
U
# 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) c43&[xP Lz
# 一般的网络攻击都是针对80和25，又以80居多 8,:lw3x1
portlist="80 25" pzU:AUW
]Y f8
# 每个ip可占用的最大活动（Established）连接数 M*F`s& vM
max_active_conn=8 $ccCI
\
UQjZhH
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 $EZr@ n
# 如果用的是ipchains，可以忽略此项 ^!SwY_>
iptables_chain_name="RH-Lokkit-0-50-INPUT" M\kct7Y
5_SxX@fW %
# 日志输出目标 &>XSQB(&%
log_facility="local0" fjS#
8+~'T|
**** 关于检查周期 **** 5WI0[ 7
程序定义了两个检查周期，如果上次检查中屏蔽了某个IP，则程序会更频繁地检查连接情况，反之则等待更长时间。通过检查周期 D+*_iM6[-
的动态调整，可以有效调度在遭受攻击和正常状态下程序的运行次数。 >n>gX/S<C
g+=f=5I3
**** ipchains vs iptables **** 2X=*;r"{J
目前该程序支持ipchains和iptables两种软件防火墙，使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 EyV 6uk~
/etc/sysconfig/iptables都没有检测到，则报错退出。 r
D|Bj(X8
OWmI$_L
**** 日志输出 **** 1VG7[#Zy
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 _\AT_Zmy
中加入一条： Yk5Cyq
local0.* /var/log/firewall.log 2}.EFQp+
然后重新启动syslog /x&52~X5-
/etc/init.d/syslog restart 1!2,K ot
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 Z'y:r2{ql
g]}E1H6-
4. 运行 o&rNM5:
/usr/prima/sbin/firewall.sh & T28Q(\C:}
-[>G@m:?e
范例输出： vv`,H ~M6
*** firewall.sh v1.0b ValueOf.com*** N x/_+JWje
Firewall is: ipchains uJ%XF*> _D
Port protected: 80 25 QCvst*
Max connection per ip: 8 hgF4PdO1e
Min time to check: 120s %2rUJaOgy$
Max time to check: 300s %hb!
1I
Timeout circle: 3600s Ec|5'Kz]
Output is logged to: local0 tf q; KR
Xq.G vZS`
察看/var/log/firewall.log，可以看到： 8J+:5b _?
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 x '`L( C
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 0D_{LBO6LU
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 <Z9 N}wY,8
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 |%7OI#t^
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 tU
(vt0~b
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 -$5nqaK?
ryoD 1OE
5. 停止 FR 1se
先用ps命令察看firewall.sh进程的进程号，然后用kill命令将其终止，如 >PK
\bLEo
# ps auxww|grep firewall.sh 73'.TReK
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh
wMru9zyI
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh dnUiNs8
第一行即firewall.sh的进程，用kill命令： P
:D6w){
# kill 27932 \H$j[
" 3
[1] Terminated /usr/prima/sbin/firewall.sh <)$b=z
即将其终止
|
常州电信/网通机房,100M共享/10M独享/1000M共享/100M独享/电信+网通双线路服务器托管
Tel：0519-89991155 企业QQ：4006023839 5y6s Inc.
|
|
[楼 主]
|
Posted: 2008-01-26 02:12 |
| |
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
