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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 jeH~<t{
X1-'COQS%&
#!/bin/sh k=JrLfD4
# this program is used to check tcp/ip connections ={d>iB yq
# and block those ip with excessive connections 8sM|%<$=j
l@+7:n4K0
# my version :hFIl0$,"3
myver="1.0RC1" 1A G<$d5U|
%'7lbpy,f
# wake up every 120s if last check found abuse client ,J^b0@S
wakeup_time_min=120 y
t
=3sq
92x(u%~E
# wake up every 300s if last check found no abuse client k_5L4c:"
wakeup_time_max=300 v }O30wE
^l=!JP=M=
# rule timeout 3600s au+kNF|Q
rule_timeout=3600 jW3!6*93
eWtZ]kB
# check port list '\ey<}?5V
portlist="80" 9m<jcxla$
&c
H V7
# max established connection per ip bg&zo;Ck8T
max_active_conn=8 X>(TrdK_9"
n}_JB
>i~
# iptables chain name B~JwHwIhA
iptables_chain_name="RH-Lokkit-0-50-INPUT" _w/EP
mdmvT ~`
# log facility BJB^m|b)
log_facility="local0" QnXA*6DJ
bRJMYs
# Block policy t2" O
ipchains_block_policy="DENY" EQ`(yj
iptables_block_policy="REJECT" X4AyX. p
Co9QW/'i
# myself GCX G/k?w:
myself=`basename $0` d `nVc50
<2|O:G
mylogger_info() 8XzR
wYV
{ 8V)^R(\;
logger -p $log_facility.info -t $myself $@ 2>/dev/null *x])Y ~oQ
} &nkW1Ner9
O<"}|nbmQ[
mylogger_debug() ]2'na?q9
{ gb > }v7
logger -p $log_facility.debug -t $myself $@ 2>/dev/null 4%}*&nsI-Z
} {Jx4xpvPo
YZ7|K<
mylogger_notice() W4e5Rb4~f"
{ Y$Y_fjd_
logger -p $log_facility.notice -t $myself $@ 2>/dev/null 2Sp=rI
} %8D z o
Eam
dotimeout() gO,25::")
{ 2 fS[J'-o
mylogger_info "reset firewall when timeout arrives" N:tY":Hi
case "$firewall" in ;D
s46M-s
ipchains) ,0~9dS
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null ^#1.l=s
if [ $? = 0 ] ; then vR=6pl$|~~
mylogger_info "ipchains restarted" 9,_mS{+B
else ~L_hZso4
mylogger_notice "ipchains restart failed" CQr<N w
fi @qjf ZH@
;; R8UYP=Kp
iptables) ~7t$MF.
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null 0} FOV`n
if [ $? = 0 ] ; then n?ctLbg
mylogger_info "iptables restarted" #8bsxx!s
else {W~q
z^>u4
mylogger_notice "iptables restart failed" V8wKAj
Ux
fi 7kK #\dI
;; +
: -57
*) npyAJ
p
mylogger_notice "neither ipchains nor iptables" >Clh] ;K
;; `#QG6/
0
esac }^*F59>H
$DC*i-}qFg
} ,\d6VB P&
X!},8}~J~
blockclient() p,<&zHb >K
{ jW O/
xX
if [ -z "$1" ] || [ -z "$2" ]; then -;XKcS7Ue
mylogger_notice "blockclient() missing client or port to block" CGP3qHrXt
return _l ],
"[d
fi gx:;&4AD
local ip port W85@v2b
z6~
H:k1G%
ip=$1 %77p5ctW
port=$2 nGf);U#K
omf Rs
case "$firewall" in yag}fQ(XH
ipchains) 7"*|2Xq
mylogger_notice "blocking $1 to $2 via ipchains" y3;q_4.
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` %T=A{<[`
if [ -z "$found" ] ; then -g/hAxb5
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" 'QH1=$Su
mylogger_debug "cmd: $cmd" @C-dG7U.P
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` wFIh6[3
if [ $? != 0 ] ; then /
<3<.
~
mylogger_notice "$cmd call failed" l
n }}5Q
return Y ?r
po
fi >7U>Yh
new_block=1 iG ,t_??
ever_block=1 $O:w(U
else M}"r#Plq
mylogger_info "$ip already blocked to $port"
w*w? S
fi N(3R |Ii
;; ftavbNR`W
iptables) 6vf\R*D|A
mylogger_notice "blocking $1 to $2 via iptables"
{sv{847V
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` <B&R6<]T
if [ -z "$found" ] ; then qtu
rd7
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" 7/X"z=Q^|
mylogger_debug "cmd: $cmd" 8C.!V =@ \
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` jUjr6b"
if [ $? != 0 ] ; then FF Gqa&
mylogger_notice "$cmd call failed" EkKnUD
return I(n* _
bFq
fi Oz:ZQ M
new_block=1 a~^Srj!}x
ever_block=1 Gwd{#7FM`
else ]Bb7(JX
mylogger_info "$ip already blocked to $port" 5>ST"l_ca
fi *"G 8
;; ^4`&EF
*) t&814Uf&\
mylogger_notice "neither ipchains nor iptables" n*qN 29sx
;; cvAtw Q'
esac <qiICb)~
} hD 46@
liNON
restartservice() u5gZxO1J5
{ ~2N-k1'-'
local service ^[M~K5Y
if [ -z "$1" ] ; then "jU
mylogger_notice "no port given to see which service to be restart" U
\ Dca&=
return iA z UaF
fi JY4_v>Aob
6dT|;koWbm
case "$1" in : 2q
?>\
80) AZ8UXq
service="httpd" %^^h) Wy}
;; f0F#Yi{fw
25) @bQ!zCI
service="postfix" E2yz=7sv5
;; l Z ~+u
110) @c"yA y^t
service="courier-pop3d" *Yp q q
;; .xv ^G?GG
21) 0P:F97"1,
service="muddleftpd" <<BQYU)Ig
;; v =+k"gm6
53) J:W'cH$cR
service="named" .5k^f5a
;; xucIjPi]
3306) wR1K8b".DC
service="mysqld" "w1 (g=n
;; 3z$\&&
BR
esac 0XQ-
if [ ! -z "$service" ] ; then 3V!x?H$
/etc/init.d/$service restart 1>/dev/null 2>/dev/null { ;' :h
if [ $? = 0 ] ; then 1'OD3~[R
mylogger_notice "$service restarted" Oylp:_<aT
else <wqRk<
mylogger_notice "$service restart failed" $@4e(Zrmo
fi ;W4:#/~14
fi {N@Y<=+:
} K+t];(
n%8#?GC`
docheckport() m4\g o
{ )da:&F -
mylogger_info "do check port $1" =z']s4
local port last_client count client total_count z'v 9j_\
jS}' cm-
if [ -z "$1" ] ; then \c'
%4Ao
mylogger_notice "docheckport() port not given" 7j{Te)"
return ,$SkaTBe
fi } pSt@3o,
se"u
m5N-
port=$1 *%]+sU
jm~mhAE#
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` 'II
vub#q
if [ $? != 0 ] ; then "& s9cO.H
mylogger_notice "netstat call failed" [_h.1oZp~
return R0z?)uU#
fi 'G3+2hah
#echo $clientlist j `w;z: G
# reset new_block gA|!$ EAM
new_block=0 `mQP{od?"?
count=0 /,-h%gj
total_count=0 Bl:{p>-q
last_client="" c4S>_qH
for client in $clientlist -(|7`
U
do 8-W"4)@b
#echo "client is $client" B=r]_&u-u
if [ -z "$last_client" ] ; then wG Z>iLe:
count=$((count+1)) -O>^eMWywo
total_count=$((total_count+1)) ^/ULh,w!fP
last_client=$client RcKQER
else f/
$ -Nl.
if [ "$client" = "$last_client" ] ; then 00$ @0
count=$((count+1)) qBf wN 1
total_count=$((total_count+1)) 1oX z[ V
else , k`YDy|#e
mylogger_debug "$last_client $count connections" Ncs4<" {$
if [ $count -ge $max_active_conn ] ; then '2Mjz6mBDA
mylogger_notice "client $last_client connection $count >= $max_active_conn" >e5q2U
blockclient $last_client $port 7TMDZ*
fi FB?q/ _
count=1 Y`E {E|J
total_count=$((total_count+1)) *Xf[b)F R
last_client=$client 24.7S LXO
fi bahc{ZC2
fi
$\JQGic`
done XSL
t;zL:
# check the last client dvrvp DoE.
if [ ! -z "$client" ] ; then 8k*
count=$((count+1)) P?yOLG+)l)
total_count=$((total_count+1)) @
[[ C s*-
mylogger_debug "$client $count connections" h>mBkJ
{
if [ $count -ge $max_active_conn ] ; then R?={{+O
mylogger_notice "client $client connection $count >= $max_active_conn" 2s]]!{Z#
blockclient $client $port 3f7t%
fi K2cp f
fi {YxSH %
mylogger_info "total connections on port $port: $total_count" 5Qm .ECXV
w;h\Y+Myyk
if [ $new_block = 1 ] ; then f;_K}23
restartservice $port 1Q2k> q8
fi y [ rB"
} cr=FMf hB
jP6oJcZ
docheckall() 3 gfV0C\
{ X=!n,=xI
# reset wakeup_time (<:rKp
wakeup_time=$wakeup_time_max y 1jGf83
for port in $portlist yg]nS<K~4
do $M8> SLd
docheckport $port #mz,HK0|aC
if [ $new_block = 1 ] ; then q[,R%6&'
# set wakeup_time shorter cause we found some abuse client *M\i4FO8
wakeup_time=$wakeup_time_min j}
x
O34
fi {1-CfQ0
8
done +h\W~muR
} I !i#=
%>*0.)wG
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then Hh'14n&W
firewall="ipchains" Xk9r"RmiOb
fi w]P7!t
+/UXy2VRt$
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then KA*
l6 `(
firewall="iptables" Z?j= '/u>@
fi FO nA;5Aa
HBf8!\0|/
if [ -z "$firewall" ] ; then d}B_ll#j-
echo "Error: This machine does not have ipchains or iptables firewall support" ,I:m*.q
exit 1 hZ /
fi Vh [o[ U
hm} :Me$[)
mylogger_info "firewall.sh v$myver ValueOf.com starting" k2,oyUT=S
mylogger_info "Firewall is: $firewall" :8!3*C-=
mylogger_info "Port protected: $portlist" {3p7`h~
mylogger_info "Max connection per ip: $max_active_conn" )LMux
j
mylogger_info "Min time to check: $wakeup_time_min""s" `m0Uj9)#
mylogger_info "Max time to check: $wakeup_time_max""s" )/i|"`) >_
mylogger_info "Timeout circle: $rule_timeout""s" WuQ<AS=
mylogger_info "Output is logged to: $log_facility" .AI'L|FQ%c
N~<}\0
# if new ip blocked at this check run? oZcw bo8
new_block=0 &Or= _5Y`
# if new ip blocked at this timeout run? 5z mHb
ever_block=0 fy-Z{
# reset wakeup_time jO
N}&/
wakeup_time=$wakeup_time_max y sn[-l#
p:>?
lasttime=`date +%s` 6@*;Wk~
KGwL09)
while [ 1 ] r!gCh`PiK
do ^* v{ t?u
curtime=`date +%s` mSw?iL
timediff=$((curtime-lasttime)) gbv[*R{<%
#echo "timediff: $timediff" gJ~*rWBK:
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then { RX
|
lasttime=$curtime rd~W.b_b
ever_block=0 (mr` ?LI}
dotimeout T.N7`
fi !fjU?_[S
docheckall -2Cf)>`v
mylogger_info "sleep for $wakeup_time""s" zk~ r KQ,
sleep $wakeup_time BFu9KS+@)
done fB
}5,22
ri V/wN9C
t[oc p;Q
!h(0b*FUJ
1. 说明 pg`;)@
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， y+x>{!pw
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 y9 ' 3vZ
该程序可以同时保护多个端口 u;1NhD<n
Q'M Ez
2. 安装 D 4-U[l+K>
tar zxf firewall-1.0b.tar.gz L, Gt IZkE
cd firewall-1.0b }=4".V`-o
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh R7b*(3 3
0~+:~$VrT
3. 配置 0R%58, R
主要配置项目如下： ?OdA`!wE
# 最小检查周期，缺省为120秒 l'f!za0
wakeup_time_min=120 7
[ji,.7
WR1 ,J0UU6
# 最大检查周期，缺省为300秒 }'-
)
wakeup_time_max=600 E/ )+hK&
Z:Am \7 I
# 重设防火墙状态的时间，缺省为3600秒 !!>G{
rule_timeout=3600 !d_A? q'hN
8~>3&jX
# 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) x{5*%}lX8
# 一般的网络攻击都是针对80和25，又以80居多 k]sT'} [n
portlist="80 25" gC- 0je
Xs_y!l
# 每个ip可占用的最大活动（Established）连接数 \)WjkhG<w#
max_active_conn=8 cxdM!L; `
XPKcF I=
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 `6su_8Hno
# 如果用的是ipchains，可以忽略此项 X=~QE}x
iptables_chain_name="RH-Lokkit-0-50-INPUT" M$9h)3(B
sqRu qUj+
# 日志输出目标 :8
:>CHa
log_facility="local0" #u^d3
$Nj
_L>n!"E/
**** 关于检查周期 **** p10->BBg
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 l:HuG!
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。 *fZ'#C~x
|1R @Jz`
**** ipchains vs iptables **** 3&f{lsLAC
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 ;p8xL)mUP
/etc/sysconfig/iptables都没有检测到，则报错退出。 S0cO00_ob
IT|CfQ [D
**** 日志输出 **** Lq.k?!D3uh
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 ,* US) &x
中加入一条： 62 ) F
local0.* /var/log/firewall.log f{0PLFj
然后重新启动syslog gqd#rjtfz
/etc/init.d/syslog restart ::6@mFL R
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 rcCM x"L=
"-
AiC6u
4. 运行 2cL< `
/usr/prima/sbin/firewall.sh & kmwF w>#
Wp $\>
范例输出： qW*)]s)z
*** firewall.sh v1.0b ValueOf.com*** ! WN r09`
Firewall is: ipchains Gwe9<
y
Port protected: 80 25 cVN|5Y
Max connection per ip: 8 JXrMtSp\
Min time to check: 120s GI/o!0"_
Max time to check: 300s >
ewcD{bt
Timeout circle: 3600s p)`JVq,H/B
Output is logged to: local0 K7|BXGL8r8
%5b2vrg~*
察看/var/log/firewall.log，可以看到： 74_ji
!
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 eG.?s ;J0
Oct 16 14:08:55 server firewall.sh: 192.168.0.60 2 connections // 有两个来自192.168.0.60的连接 *5^h>Vk/
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 *`[LsG]ZF
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 #~"jo[
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 kAMt8
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 z ,vjY$t:/
B|tP 3<
5. 停止 5=eGiF;0 \
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 :EZTJu
# ps auxww|grep firewall.sh uTQ/_$
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh opKtSF|)
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh < Fi
/!
第一行即firewall.sh的进程，用kill命令： Hc71 .rqS
# kill 27932 _15r!RZ:1
[1] Terminated /usr/prima/sbin/firewall.sh 1Ypru<.)W
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
