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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 iN;Pg _Kq
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#!/bin/sh @C;1e
7
# this program is used to check tcp/ip connections y{<e4{
!
# and block those ip with excessive connections $WA wMS,
1T^WMn:U
# my version A l$z.i?R
myver="1.0RC1" +H-=
`+,
o_:v?Y>0
# wake up every 120s if last check found abuse client SB62(#YR
wakeup_time_min=120 k8gH#ENNK
{R1]tGOf
# wake up every 300s if last check found no abuse client u0C: q`;z
wakeup_time_max=300 w kg4I .
< 8r"QJY/
# rule timeout 3600s +B ?qx
Q
rule_timeout=3600 1X Gg0SC
@|gG3
# check port list !0{SVsc )
portlist="80" Jqoo&T")
) nm+_U
# max established connection per ip G]lGoa}]`u
max_active_conn=8 .S` q2C \
6H#: rM
# iptables chain name = s\$i0A2
iptables_chain_name="RH-Lokkit-0-50-INPUT" *C*J1JYp+
6-U_TV
# log facility Mh%{cLM
log_facility="local0" VG5+
u,U6>
{vu\ qXmMv
# Block policy tP'v;$)9F
ipchains_block_policy="DENY" Ah2@sp,z
iptables_block_policy="REJECT" Tm %5:/<8
M9"Bx/
# myself J( 1Tl
myself=`basename $0` A 3 V
jz!I +
mylogger_info() r-qe7K@p
{ QqM[W/&R
logger -p $log_facility.info -t $myself $@ 2>/dev/null p6JTNx D
} '54\!yQ<{
86#l$Q aK{
mylogger_debug() :WB u U
{ V]zZb-m=
logger -p $log_facility.debug -t $myself $@ 2>/dev/null b++r#Q
g
} &}DfIP<
.}__XWK5
mylogger_notice() D||0c"E
{ (~~m8VJ>
logger -p $log_facility.notice -t $myself $@ 2>/dev/null !5,C"r
} ':.Hz]]/A
:9&c%~7B9
dotimeout() # ~<
]z
{ . fWy\ r0
mylogger_info "reset firewall when timeout arrives" s^u Y
case "$firewall" in O:?3B!wF
ipchains) $PJ==N
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null
/,G `V
if [ $? = 0 ] ; then M+ [ho]
mylogger_info "ipchains restarted" JBY.e r`6C
else 'rhgM/I
mylogger_notice "ipchains restart failed"
\HG f!zZ
fi TpU\IQ
;; =Jm[1Mgt
iptables) W9SU1{*9
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null (?e%w}
if [ $? = 0 ] ; then '| i?-(
f)
mylogger_info "iptables restarted" uj.i(U s
else =MNp;
mylogger_notice "iptables restart failed" zQ,rw[C"W
fi ]-gy XE1.r
;; ggD T5hb
*) i{^T;uAE
mylogger_notice "neither ipchains nor iptables" ]dUG=dWO
;; bYsX?0T!p
esac =|oi 0
"3RFy i
} c}(H*VY2n
Ty g>Xv
blockclient() E+]}KX:
{ cx[^D,usf~
if [ -z "$1" ] || [ -z "$2" ]; then !|[rh,e]
mylogger_notice "blockclient() missing client or port to block" of B:7
return k%6CkC w
fi "D'e
local ip port hl1I G
!
sh
:$J[
ip=$1 @j|E"VYY
port=$2 Tz1^"tx9
@j\:K<sk
case "$firewall" in %#2
$B+
ipchains) D, ")n75
mylogger_notice "blocking $1 to $2 via ipchains" KW:N
6w
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` #Y=^4U`
if [ -z "$found" ] ; then hhU
_kI
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" ep6+YK:cn
mylogger_debug "cmd: $cmd" _ /1/ {
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` C5 ~~$7k0
if [ $? != 0 ] ; then av'm$I|O
mylogger_notice "$cmd call failed" 7D AP_ C
return D
/QLp3+o
fi
^.A*m MQ
new_block=1 qPPe)IM'Sc
ever_block=1 QoYEWXT|g
else RRja{*R
mylogger_info "$ip already blocked to $port" C~2!@<y
fi UyRy>:n
;; <@Q27oEuA
iptables) &qbEF3p^@
mylogger_notice "blocking $1 to $2 via iptables" AMyg>n!
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` I~6)
Gk&
if [ -z "$found" ] ; then {.LJ(|( Mz
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" wh( _<VZ
mylogger_debug "cmd: $cmd" Gi)Vr\Q.
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` Y#@D%
a8
if [ $? != 0 ] ; then #z P-, 2!r
mylogger_notice "$cmd call failed" $+80V{J#
return @1o X&#
fi N[cIr{XBGN
new_block=1 jj`#
;Y
ever_block=1 d}O\:\}y
else E+Bc>xl@ m
mylogger_info "$ip already blocked to $port" }F]Z1( '
fi ;y(;7n_ a
;; k[8F: T-
*) :|(YlNUv
mylogger_notice "neither ipchains nor iptables" B=O zP+
;; &-*l{"7p+%
esac R([zlw~B5
} *Hx*s_F
IFBt#]
l0
restartservice() mP*$wE9b,:
{ |-ZML~2S=h
local service Zd-qBOB2L
if [ -z "$1" ] ; then = 9Yf o,F
mylogger_notice "no port given to see which service to be restart" L--
t(G
return Z =8&`
fi "&H'?N%9Up
- G>J
case "$1" in 3!9JXq%Hl
80) <6;M\:Y*T
service="httpd" _Yo)m |RaB
;; 6Mk#) ebM
25) sq=EL+ =j
service="postfix" Hx6O Dj[-
;; }-:B`:K&
110) >h%>s4W
service="courier-pop3d" 2W0nA t
;; g5# Lo Gc
21) ;uAh)|;S#
service="muddleftpd" ZN H-0mk
;; \
C:Gx4K
53) T[OI/ WuK
service="named" g<;pyvq|:
;; nY MtK
3306) d s`YVXKH
service="mysqld" T x
Mh_
;; )-X8RRw'
esac RCfeIHL
if [ ! -z "$service" ] ; then W\j'8^kI9
/etc/init.d/$service restart 1>/dev/null 2>/dev/null KRGj6g+
if [ $? = 0 ] ; then {
(.@bT@
mylogger_notice "$service restarted" <`-sS]=d}
else rZ,3:x-:
mylogger_notice "$service restart failed" >7@,,~3
fi )}$rgYKJ
fi 3KqRw (BK
} #3Z AMV
\<9aS Y'U
docheckport() V
%[t'uh
{ 1d! s8um;
mylogger_info "do check port $1" ~c&sr5E
local port last_client count client total_count gjD|f2*x
V*JqC
if [ -z "$1" ] ; then %npLgCF
mylogger_notice "docheckport() port not given" OS %[SHs
return Otr=+i
ZI
fi `
[E -V
p" .wqg*W
port=$1 <x$nw'H9
_3u3b/%J?
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` BbFLT@W4
if [ $? != 0 ] ; then @f
A| y
mylogger_notice "netstat call failed" l %zbx"%x
return s BW yU D
fi oFyB-vpYQV
#echo $clientlist 1C c 9 1
# reset new_block Q7`)&^
Hx
new_block=0 YG?4DF
count=0 L\#G#1x8
total_count=0 H! FaI(YZl
last_client="" NH5sV.vvc
for client in $clientlist _"H\,7E
do $uwz` N:
#echo "client is $client" m0 W3pf
if [ -z "$last_client" ] ; then _8SB+s*
count=$((count+1)) !:xE
X~
total_count=$((total_count+1)) ~tL:r =
last_client=$client h"]v+u`!SM
else xJN
J vA
if [ "$client" = "$last_client" ] ; then a|T P2m
count=$((count+1)) (#LV*&K%IC
total_count=$((total_count+1)) 9(ANhG
else wgzjuTqwBF
mylogger_debug "$last_client $count connections" ^<[oKi;>
if [ $count -ge $max_active_conn ] ; then ]}~*uT}>
mylogger_notice "client $last_client connection $count >= $max_active_conn" aL+k1v[m
blockclient $last_client $port |UBR8
fi ]%ikr&78u
count=1 7cY_=X-?Y
total_count=$((total_count+1)) &tHT6,Xv(
last_client=$client VO#]IXaP
fi Y@_ i32,r
fi K (Z d-U
done HQ ^> ~
# check the last client iV( B0z
if [ ! -z "$client" ] ; then ?f CLiK
count=$((count+1)) L7%Dc2{^(
total_count=$((total_count+1)) 1LT)%_d@
mylogger_debug "$client $count connections" FzA_-d/_dg
if [ $count -ge $max_active_conn ] ; then ^HX={(ddK
mylogger_notice "client $client connection $count >= $max_active_conn" !`)-seTm
blockclient $client $port 6wIv7@Y
fi dkLc"$( O
fi O&E1(M|*>
mylogger_info "total connections on port $port: $total_count" L8T T54fM
DIkD6n?V
if [ $new_block = 1 ] ; then %:YON,1b=7
restartservice $port E9! IGci
fi Ga+\b >C
} XD z![s
V-O 49
docheckall() IP-CN
{ y? )v-YGu
# reset wakeup_time EYcvD^!1g
wakeup_time=$wakeup_time_max 8
y/YX
for port in $portlist
]i=-/
do Q^b_+M
docheckport $port lWd)(9K j
if [ $new_block = 1 ] ; then 7.hVbjy'-
# set wakeup_time shorter cause we found some abuse client rs=wEMq/
wakeup_time=$wakeup_time_min v}+axu/?
fi ;7K5Bo
done 9'Pyo`hJ#U
} +}I[l,,xy
j/ #kO?
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then DN&ZRA
firewall="ipchains" >Y1?`
fi Zo-E0[9
&:S_ewJK7
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then #CW]70H`
firewall="iptables" {5
#P1jlT
fi tURIDj%#p
mE}``
if [ -z "$firewall" ] ; then {iYu
x;(
echo "Error: This machine does not have ipchains or iptables firewall support" jMzHs* :
exit 1 ig")bt3s5
fi |n}W^}S5
$P866F
mylogger_info "firewall.sh v$myver ValueOf.com starting" 0`h[|
FYV
mylogger_info "Firewall is: $firewall" {l0 ;G) -
mylogger_info "Port protected: $portlist" #E{aN?_
mylogger_info "Max connection per ip: $max_active_conn" b hOy x
mylogger_info "Min time to check: $wakeup_time_min""s" 28f-8B
mylogger_info "Max time to check: $wakeup_time_max""s" N>/*)Frt
mylogger_info "Timeout circle: $rule_timeout""s" zv@'x
nY]
mylogger_info "Output is logged to: $log_facility" i\3BA"ZX
<^~Xnstl
# if new ip blocked at this check run? Gqk"%irZ
new_block=0 ![7v
_l\Q
# if new ip blocked at this timeout run? YUT"A{L
ever_block=0 W#u}d2mP
# reset wakeup_time @Sq=#f/=
wakeup_time=$wakeup_time_max 6
N~ jt
<j ;HRm
lasttime=`date +%s` ,H22; UV9
qt^%jIv
while [ 1 ] 6ynQCD
do g~FB&U4c
curtime=`date +%s` [O"i!AQ
timediff=$((curtime-lasttime)) )P|%=laE8
#echo "timediff: $timediff" Mky$#SI11
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then .7ahz8v
lasttime=$curtime {@Diig
ever_block=0 Se0/ysVB
dotimeout hf:n!+,C
fi k`oXo%
docheckall i$"FUC~'
mylogger_info "sleep for $wakeup_time""s" B
susXW$
sleep $wakeup_time lmH!I )5
done *ivbk /8
pxI*vgfN7
JGj_{|=:
}[LK/@h
1. 说明 `(Q58wR}
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， YgM6z K~
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。 y*uL,W
H
该程序可以同时保护多个端口 /3KEX{'@U
{E6W]Mno
2. 安装 Qbv)(&i# ~
tar zxf firewall-1.0b.tar.gz zN2sipJS8
cd firewall-1.0b 1+y&n?
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh Rx`0VQ
l\$C)q6O
3. 配置 n8:2Z>
主要配置项目如下：
t8?+yG;
# 最小检查周期，缺省为120秒 QtN0|q{af
wakeup_time_min=120 $<ZX};/D
wV5<sH__
# 最大检查周期，缺省为300秒 H.>KYiv+
wakeup_time_max=600 HnY: gu
X,y$!2QI
# 重设防火墙状态的时间，缺省为3600秒 /OxF5 bN2
rule_timeout=3600 2ZE4^j|
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) xUSIck
# 一般的网络攻击都是针对80和25，又以80居多 u"|.]r
portlist="80 25" niA{L:4
gl!3pTC
# 每个ip可占用的最大活动（Established）连接数 GbL,k? ey
max_active_conn=8 {?m ',sG;&
<?Lj!JGX
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 ]\_4r)cN<n
# 如果用的是ipchains，可以忽略此项 DH 9?~|
iptables_chain_name="RH-Lokkit-0-50-INPUT" WrG)&&d
pkxW19h*0
# 日志输出目标 |J6CH87>
log_facility="local0" F`3 8sq
M~"K@g=Wr
**** 关于检查周期 **** ,$*IJeKx
程序定义了两个检查周期，如果上次检查中屏蔽了某个IP，则程序会更频繁地检查连接情况，反之则等待更长时间。通过检查周期 z!F?#L5
的动态调整，可以有效调度在遭受攻击和正常状态下程序的运行次数。 `[:f ;2(@
Pd@?(WQ
**** ipchains vs iptables **** 0#yo\McZ
目前该程序支持ipchains和iptables两种软件防火墙，使用何种是由程序启动时自动检测的。如果/etc/sysconfig/ipchains和 @|cas|U.r
/etc/sysconfig/iptables都没有检测到，则报错退出。 ChB
ZGuO:
/sYD+*a
**** 日志输出 **** +q =/}|
程序的输出信息记录在系统日志中，目标是local0。如果没有特殊配置，可以在/var/log/messages中看到。建议在/etc/syslog.conf 0<P
-`|X
中加入一条： ^ 5UIbA(
local0.* /var/log/firewall.log c5t?S@b
然后重新启动syslog V=
.'Db2D
/etc/init.d/syslog restart *.i` hfR c
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 WJg?R ^
,Z52d ggD
4. 运行 M/#<=XhA
/usr/prima/sbin/firewall.sh & un..UU4
p'_* >%4~
范例输出： ] ^.#d
*** firewall.sh v1.0b ValueOf.com*** \a}%/_M\
Firewall is: ipchains Rr:,'cXGi
Port protected: 80 25 0h#' 3z<
Max connection per ip: 8 c"fnTJXr79
Min time to check: 120s Mb+cXdZb
Max time to check: 300s :GO}G`jY
Timeout circle: 3600s \5O4}sm$*
Output is logged to: local0 xy[R9_V
b^FB[tZ\x
察看/var/log/firewall.log，可以看到： 0h$23.
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 ZG<<6y*.
Oct 16 14:08:55 server firewall.sh: 192.168.0.60 2 connections // 有两个来自192.168.0.60的连接 UX(#C,qgG
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 A <AZs~f
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 &|55:Y87
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 :3u>%
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 KLlW\MF1
8g&uCv/Uk
5. 停止 mVW:]|!s
先用ps命令察看firewall.sh进程的进程号，然后用kill命令将其终止，如 >* dqFZF
# ps auxww|grep firewall.sh FhS:.
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh [,$] %|6wt
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh A Ehh
6v
第一行即firewall.sh的进程，用kill命令： @)|62Dv /
# kill 27932 hb zU?_}
[1] Terminated /usr/prima/sbin/firewall.sh <<Ut@243\
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
