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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限
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#!/bin/sh @&?E3?5ll
# this program is used to check tcp/ip connections q;Tdqv!Ju
# and block those ip with excessive connections w^z5O 6
V[ju7\>$ Z
# my version uP, iGA
myver="1.0RC1" <|Srb s+
5;'(^z-bL
# wake up every 120s if last check found abuse client 0 1=nS?
wakeup_time_min=120 |y9(qcKn$
@~k 4,dJ
# wake up every 300s if last check found no abuse client %"-bG 'Yc
wakeup_time_max=300 %O6r
"Vh3hnS~
# rule timeout 3600s "uCO ?hv0
rule_timeout=3600 [wU e"{
Hb}O/G$a*
# check port list RO+ jVY~H-
portlist="80" PAng(tubl
'41' Gn
# max established connection per ip |w5m2Z
max_active_conn=8 Zt_~Zxn3
&!P' M
# iptables chain name H9;0$Y(e-
iptables_chain_name="RH-Lokkit-0-50-INPUT" [|".j#ZlK
U!d|5W.{Q
# log facility c wNJ{S+
log_facility="local0" ~ c,CngeL0
QB
uX#bDV
# Block policy u9nJ;:
ipchains_block_policy="DENY" [)+wke9
iptables_block_policy="REJECT" ?f}?I`S,
3r VfBz
# myself s$%t2UaV
myself=`basename $0` JDJ"D\85
(>
W \Nf
mylogger_info() z$gtGrU
{ qk~m\U8r
logger -p $log_facility.info -t $myself $@ 2>/dev/null 80zpR
U"
} _ amP:h
l`uI K.
mylogger_debug() P_4E<"eK
{ b wM?DY
logger -p $log_facility.debug -t $myself $@ 2>/dev/null He,, bq
} 78 w
l A%FS]vh
mylogger_notice() Jd^Lnp6?
{ SJ91(K
logger -p $log_facility.notice -t $myself $@ 2>/dev/null JK`$/l |7
} M^*\ $K%
2e HVl.C5
dotimeout() (dZ]j){
{ /ej[oR
mylogger_info "reset firewall when timeout arrives" s`ZP 2"`f
case "$firewall" in 06O_!"GD}
ipchains) "u]&~$
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null )Gavjj&uJ
if [ $? = 0 ] ; then KF6C=,Yc%
mylogger_info "ipchains restarted" NT0n [o^
else ?2l `%l5(
mylogger_notice "ipchains restart failed" ,jEc4ih4
fi AT)b/ycC
;; aZ$5"
iptables) ?m5E Xe
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null N2k<W?wQ
if [ $? = 0 ] ; then UOsK(mB
mylogger_info "iptables restarted" R)BXN~dQ
else a _ +?#m
mylogger_notice "iptables restart failed" A+!,{G
fi g0bYO!gC r
;; 0Dna+V/jI
*) l_/(J)|a
mylogger_notice "neither ipchains nor iptables" mE`qA*=?
;; -&sY*(:n_
esac ;:j 1FOj
w6Nn x5Ay
} n8F~! |lQ0
4")`}T
blockclient() tnaFbm p
{ Vn4wk>b}$2
if [ -z "$1" ] || [ -z "$2" ]; then >xabn*Kq
mylogger_notice "blockclient() missing client or port to block" ,bXZ<RY
$
return &G\mcstX
fi w+>+hq
local ip port gT_KOO0n
~<f[7dBv
ip=$1 UPU$SZAIx
port=$2 HK8 sn1j
_yv# v_Z
case "$firewall" in >i,_qe?V:w
ipchains) <- !1`@l>
mylogger_notice "blocking $1 to $2 via ipchains" X8Q' *
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` }a| | @unr
if [ -z "$found" ] ; then d]] z )
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" YND}P9 h
mylogger_debug "cmd: $cmd" g w([08
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` 4}h}`KZZ
if [ $? != 0 ] ; then WJOoDS!i
mylogger_notice "$cmd call failed" \]V:>=ry>
return ^;RK-)
fi &
"&s ,
new_block=1 &bW,N
ever_block=1 l ,7&
z
else Bz/Vzc(
mylogger_info "$ip already blocked to $port" Wr%ov6:
fi a)JXxst
;; d
fj23+
iptables) <bKtAf
mylogger_notice "blocking $1 to $2 via iptables" eo0-aH s
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` yV!4Im.>
if [ -z "$found" ] ; then js< d"m*
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" CaJ-oy8
mylogger_debug "cmd: $cmd" .J)TIc__|A
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` iYSt
l
if [ $? != 0 ] ; then 'dwT&v]@
mylogger_notice "$cmd call failed" s$R /!,c
return ^HSxE
fi fY!?rZ)$
new_block=1 ]nhh|q9r{
ever_block=1 b_31 \
else "CT}34 l
mylogger_info "$ip already blocked to $port" /I`TN5~
fi
r%PWv0z_c
;; xol %\$|
*) zuvPV{
X
mylogger_notice "neither ipchains nor iptables" fjRVYOG#
;; G)Gp}4gV}
esac {]Hi Tpn
} &kg^g%%
nje7?Vz
restartservice() rwF$aR>9
{ c{=Sy;i@
local service =?RI`}vw_H
if [ -z "$1" ] ; then ^[?y 2A:
mylogger_notice "no port given to see which service to be restart" C}8#yAS9M
return %R k|B`ST
fi GcVQz[E
4D?h }U /
case "$1" in 4\;zz8 5E
80) I=0c\ U}
service="httpd" 3(BL
;; /Q1*Vh4
25) rnIj pc F
service="postfix" ")Fd'&58
;; B.8B1MFm
110) V?{d<Ng~J
service="courier-pop3d" ,h*gd^i
;; W'./p"2g
21) ?2<)
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service="muddleftpd" Tv``\<
;; ;+
hh|NiQ
53) Cj0 r2^`
service="named" KdEvu?
;; !M~:
#k
3306) ziM{2Fs>
service="mysqld" Yk Ku4f
;; I{IB> j}8
esac 1 w>[
if [ ! -z "$service" ] ; then q<09]i
/etc/init.d/$service restart 1>/dev/null 2>/dev/null KX PCkNIN!
if [ $? = 0 ] ; then ?{J1 &;j*
mylogger_notice "$service restarted" ZdW+=;/#
else 7Jb&~{DVk
mylogger_notice "$service restart failed" db )2>
fi 6qZQ 20h
fi ;j0.#P:a
} {\$S58 5
eXl?f_9
docheckport() e@hPb$7
{ X_PzK'#m
mylogger_info "do check port $1" |.; N_i
local port last_client count client total_count + wQ5m8E
A+/Lt>+AS
if [ -z "$1" ] ; then xM_#F xJb
mylogger_notice "docheckport() port not given" r'i9
9 ~
return kHK<~ srB
fi U`*we43
ir^d7CV,
port=$1 Dk\%,[4(
H;=y R]E
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` v=^^Mr"Z^
if [ $? != 0 ] ; then T#&1q]P1F
mylogger_notice "netstat call failed" uNf'Zeo
return za6 hyd^
fi + aL6
$
#echo $clientlist |mhKD#:
# reset new_block wW TuEM
new_block=0 z {R
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count=0 IiKU =^~w
total_count=0 Xp;'Wa"@
last_client="" @ !$xSH
for client in $clientlist +^:uPW^U
do 7gtaI3
#echo "client is $client" &'\-M6GW
if [ -z "$last_client" ] ; then 4 1R~.?
count=$((count+1)) \1R*M
total_count=$((total_count+1)) hj=
n;,a9
last_client=$client DI{Qs[
else j\#)'>"
if [ "$client" = "$last_client" ] ; then W&A^.% 2l
count=$((count+1)) S?DMeZ{
:
total_count=$((total_count+1)) u}'m7|)8
else )m-(-I
mylogger_debug "$last_client $count connections" o<|u4r={s
if [ $count -ge $max_active_conn ] ; then ddYb=L+_b
mylogger_notice "client $last_client connection $count >= $max_active_conn" RCkmxO;b&
blockclient $last_client $port EhW@iYL
fi TPJuS)TU9
count=1 $y)tcVc
total_count=$((total_count+1)) BAqwYWdS
last_client=$client 9aID&b +
fi rl"yE=
fi JpQV7}$
done #,j m3M qj
# check the last client ' fb&3
if [ ! -z "$client" ] ; then 7CT446
count=$((count+1)) V2Z^W^
total_count=$((total_count+1)) a/d8_(0
mylogger_debug "$client $count connections" ylmVmHmc
if [ $count -ge $max_active_conn ] ; then 4YMUkwh
mylogger_notice "client $client connection $count >= $max_active_conn" rp-.\Hl/a
blockclient $client $port ?AQR\)P
fi NS4 W!o;"
fi :2L-Nf
mylogger_info "total connections on port $port: $total_count" K>+c2;t;
B3u:D"t
if [ $new_block = 1 ] ; then 3k+46Wp
restartservice $port S?H
qrf7<
fi Oi!uJofW
} c
}7Rt|`c
:as2fO$?
docheckall() F-?s8RD
{ 9(9\kQj{C
# reset wakeup_time 62OZj%CXN
wakeup_time=$wakeup_time_max |A
u+^#:;
for port in $portlist 2K(zYv54
do k5Df9 7\s
docheckport $port Gy[m4n~Z5
if [ $new_block = 1 ] ; then BG20R=p
# set wakeup_time shorter cause we found some abuse client gM#]o QOGE
wakeup_time=$wakeup_time_min oGZ%w4T
fi x_K JCU
done 7gbu7"Qc
} %,5_]bGvb
[lAZ)6E~=
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then <bOi}
firewall="ipchains" sZP
A(N?
fi e/!xyd
1A\N $9Dls
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then +dSO?
Y]
firewall="iptables" -Fs<{^E3j
fi S_56!
w+3-j
if [ -z "$firewall" ] ; then m&8
'O\$
echo "Error: This machine does not have ipchains or iptables firewall support" niJtgK:H^
exit 1 3 N5b3 F
fi TW}nO|qw
3rw<#t;v
mylogger_info "firewall.sh v$myver ValueOf.com starting" x.~AvJ
mylogger_info "Firewall is: $firewall" x\R
8W8M
mylogger_info "Port protected: $portlist" = L&}&pT
mylogger_info "Max connection per ip: $max_active_conn"
- }9a%
mylogger_info "Min time to check: $wakeup_time_min""s" kls
6Dk#
mylogger_info "Max time to check: $wakeup_time_max""s"
NvqIYW
mylogger_info "Timeout circle: $rule_timeout""s" y)e 8pPD G
mylogger_info "Output is logged to: $log_facility" %d#h<e|,.
$
,9A?'
# if new ip blocked at this check run? XIJW$CY
new_block=0 _)? 59
# if new ip blocked at this timeout run? MYVgi{
ever_block=0 V 0M&D,
# reset wakeup_time VuWBWb?0Q
wakeup_time=$wakeup_time_max 7dbGUbT
(6#,
$Ze
lasttime=`date +%s` -\V!
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7 8fFAN`
while [ 1 ] T@)|0M
do .Do(iYO.L
curtime=`date +%s` EAPjQA -B?
timediff=$((curtime-lasttime)) LW '3m 5
#echo "timediff: $timediff" oW
\k%Vj
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then oDBv5
lasttime=$curtime GLE/ 1
ever_block=0 /_l$h_{DH
dotimeout bs9X4n5
fi 'NYW`,
docheckall 6I!B>V#U+
mylogger_info "sleep for $wakeup_time""s" p]E\!/
sleep $wakeup_time bc}BQ| Q
done O; #qG/b1
r(6$.
zx
d$T 856
qb 1JE[2F
1. 说明 > t~2
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， J,Rp&tavt:
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 ;\48Q;
该程序可以同时保护多个端口 gHmy?+ )
9T;DF UM
2. 安装 {
d|lN:B
tar zxf firewall-1.0b.tar.gz H05xt$J
cd firewall-1.0b V3v/h V:
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh @h)Z8so
3EO:Uk5<
3. 配置 _A]=45cn
~
主要配置项目如下： 9L7jYy=A#
# 最小检查周期，缺省为120秒 .6HHUy
wakeup_time_min=120 n>k1 D
_oAWj]~rO
# 最大检查周期，缺省为300秒 Bh
,GQHJ
wakeup_time_max=600
n&\DJzW\#
Cr>YpWm
# 重设防火墙状态的时间，缺省为3600秒 *w5xC5 *
rule_timeout=3600 y)uxj-G
o_R_
# 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) )PCh;P0C
# 一般的网络攻击都是针对80和25，又以80居多 !Y^3%B%
portlist="80 25" nX M[#~
b`&
:`
# 每个ip可占用的最大活动（Established）连接数 MN<uIqG
max_active_conn=8 :J;&Z{
vugGMP;D(
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 |] cFsB#G
# 如果用的是ipchains，可以忽略此项
iTc q=
iptables_chain_name="RH-Lokkit-0-50-INPUT" GD@|X wK){
,%d?gi"&
# 日志输出目标 O/Mx $Q3re
log_facility="local0" V)jF]u~g
fjh,e
**** 关于检查周期 **** < *[D30<
程序定义了两个检查周期，如果上次检查中屏蔽了某个IP，则程序会更频繁地检查连接情况，反之则等待更长时间。通过检查周期 \V
%l.P4>e
的动态调整，可以有效调度在遭受攻击和正常状态下程序的运行次数。 'Rq2x-72}
U#g ,XJ
**** ipchains vs iptables **** cxz\1Vphd
目前该程序支持ipchains和iptables两种软件防火墙，使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 RfQ*`^D
/etc/sysconfig/iptables都没有检测到，则报错退出。 LXS)(-&
{66P-4Ev(
**** 日志输出 **** H>Q
X?>j
程序的输出信息记录在系统日志中，目标是local0。如果没有特殊配置，可以在/var/log/messages中看到。建议在/etc/syslog.conf WwF2Ry^a
中加入一条： UH`cWVLpr
local0.* /var/log/firewall.log A@ZsL
然后重新启动syslog t~M0_TnXlP
/etc/init.d/syslog restart E-v^eMWX
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 ~nR bb ;M
CZDWEM}
4. 运行 ")i_{C,b^
/usr/prima/sbin/firewall.sh & ]PQ6 em
& f-x+
y
范例输出： TpRI +*\
*** firewall.sh v1.0b ValueOf.com*** ,A[NcFdCB
Firewall is: ipchains >~* }9y0$
Port protected: 80 25 j2s{rQQ
Max connection per ip: 8 _j2q
Min time to check: 120s K;*B$2Z#k
Max time to check: 300s go?}M]c%7
Timeout circle: 3600s n8Rsle`a
Output is logged to: local0 h~5gHx/ a
,:xses*7
察看/var/log/firewall.log，可以看到： l,ic-Y1
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 h3j` X'
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 $_ O;yz
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 .o)
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 2 #X>^LH
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 an)Z .x
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 F7\nG}#s
juEH$7N !
5. 停止 IgEVz^W?h
先用ps命令察看firewall.sh进程的进程号，然后用kill命令将其终止，如 " nLW vV1
# ps auxww|grep firewall.sh E=]$nE ]b
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh %afz{a5
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh -IS $1
第一行即firewall.sh的进程，用kill命令： A'suZpL
# kill 27932 7ZFd;-
[1] Terminated /usr/prima/sbin/firewall.sh y4,t=Gq7^
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
