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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 kL 6f^MoL
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#!/bin/sh #/Y t4n
# this program is used to check tcp/ip connections lpQsmd#
# and block those ip with excessive connections ( {ad s_l
&~ QQZ]q6
# my version 6q RZ#MC
myver="1.0RC1" X
2hV)8Sk
br*L|s\P\9
# wake up every 120s if last check found abuse client 5M4mFC6
wakeup_time_min=120 :A%uXgK<k
V'sp6:3*\
# wake up every 300s if last check found no abuse client 8`XT`H
wakeup_time_max=300 <*E{z r&
P dcF
# rule timeout 3600s Mt(wy%{zK
rule_timeout=3600 D_ybgX?0:
Sd'!(M^k3
# check port list "z)dz ,&T
portlist="80" e;\g[^U
PXof-W
# max established connection per ip o65:)z
u
max_active_conn=8 u;18s-NY
xa#0y
# iptables chain name lp3 A B
iptables_chain_name="RH-Lokkit-0-50-INPUT" - ?_a
YJ
[ &RZ&
# log facility {Tb(4or?=b
log_facility="local0" s1. YH?A;
QNj hA'[T
# Block policy cf)2GoV>e
ipchains_block_policy="DENY" 25]Mi2
_
iptables_block_policy="REJECT" 0 1<~~6A
(yIl ]ZN*
# myself #D~at gR
myself=`basename $0` (~}IoQp>
[<`K%1GQ
mylogger_info() a<9 gD,] P
{ G&$+8 r
logger -p $log_facility.info -t $myself $@ 2>/dev/null ~&B{"d
} VcK u fV'
F`KA^ZI
mylogger_debug() rKEi1b
{ OEmz`JJ67
logger -p $log_facility.debug -t $myself $@ 2>/dev/null UUi@
U
} W tOpxAq
Sn=|Q4ZN
mylogger_notice() Q-o}Xnj*!L
{ aHx(~&hRcL
logger -p $log_facility.notice -t $myself $@ 2>/dev/null .O! JI"?
} _ 1jd{? kt
))f%3_H
dotimeout() Si#I^aF`%
{ FG]xn(E
mylogger_info "reset firewall when timeout arrives" zvv<w@rX
case "$firewall" in "`]G>,r_
ipchains) |hms'n0
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null <>JN?
if [ $? = 0 ] ; then .y'iF>QQ\
mylogger_info "ipchains restarted" L&V
;Xvbu%
else feM%
-
mylogger_notice "ipchains restart failed" c"`o V! m
fi j9"uxw@
;; (
H CB\!g
iptables) q
SR\= :$
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null ^uB9EP*P
if [ $? = 0 ] ; then V5w00s5?%
mylogger_info "iptables restarted" !$ &k@#v:
else )p*I(y
mylogger_notice "iptables restart failed" f P'qUN
fi cQ( zBf
;; 4q sIJJ[.
*) (A!+$}UR
mylogger_notice "neither ipchains nor iptables" <vxj*M;
;; _'pow&w~
esac ~2
L{m[s|
J2A+x \{<
} #OlU|I
r eo
blockclient() B*=m%NXf
{ I k[aiz
if [ -z "$1" ] || [ -z "$2" ]; then <T ]BSQk
mylogger_notice "blockclient() missing client or port to block" 7ux0|l
return cp D=9k!*K
fi ! 6y<jJ>
local ip port ] 2O52r
M"cB6{st[
ip=$1 QwF\s13
port=$2 Dn{
hU $*
@9-/p
^n1
case "$firewall" in fL^+ Qb}
ipchains) c6 O1Z\M@\
mylogger_notice "blocking $1 to $2 via ipchains" J<K- Yeph
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` P#e 1?
if [ -z "$found" ] ; then <'s_3A C
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" lw/zgR#|
mylogger_debug "cmd: $cmd" yb 7
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` #<_gY
if [ $? != 0 ] ; then LjZvWts?
mylogger_notice "$cmd call failed" 2hZ>bg
return k jCXP
fi Xx.4K>j+j
new_block=1 ?&qa3y)wX:
ever_block=1 _8*}S=
else SZ/}2_;
mylogger_info "$ip already blocked to $port" :.;p Rz
fi t(<^
of:
;; 93Z/|7
iptables) p]/qf \E
mylogger_notice "blocking $1 to $2 via iptables" jZRf {
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` "EA6RFRD
if [ -z "$found" ] ; then X<pg^Y0
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" h6Fe mis
mylogger_debug "cmd: $cmd" 5|T[:m
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` 1|]IWX|
if [ $? != 0 ] ; then 1 _A B; ^
mylogger_notice "$cmd call failed" ^,P#
<,D,
return x2q6y
fi B=0U^wL
new_block=1 A&HN7C%X
ever_block=1 U;o
$ =,_p
else z%lu%
mylogger_info "$ip already blocked to $port" Vn ZRsFY<^
fi }OQaQf9V{
;; % oPt],>
*) -?jI{].:8
mylogger_notice "neither ipchains nor iptables" /G
{;?R
;; 3YKJN 4
esac >GbCRN~
} ~}lYp^~:J
lpjeEaw o4
restartservice() fX
^h O+f
{ 3Mmp B9l#H
local service n@TK}?\UoR
if [ -z "$1" ] ; then & b Kl(,
mylogger_notice "no port given to see which service to be restart" 9<e%('@[
return eD (;W n
fi O/(QLgUr
Li'>pQ+
case "$1" in vz$_Fgsc.
80) F
K7cDaI
service="httpd" 4# L}&
;; EZ"n3#/
25) 3R}O3#lj,
service="postfix" Q !91 uNL
;; Jbv[Ql#
110) &x":
service="courier-pop3d" \80W?9qj
;; RXi/&'+H
21) =O1py_m
service="muddleftpd" rW P
-Rm
;; A2 r\=for
53) nF )b4`Nd
service="named" _.{I1*6Y2
;; .c5)`
3306) {vhP'!a6W
service="mysqld" rjo1
;; @ Y &UP
esac m|M'vzu1
if [ ! -z "$service" ] ; then tKX +eA]
/etc/init.d/$service restart 1>/dev/null 2>/dev/null L25v
7U
if [ $? = 0 ] ; then xXRlQ|84
mylogger_notice "$service restarted" u)4eu,MBT
else ;ztt*py
mylogger_notice "$service restart failed" +V ` *
fi T&q0 TBT
fi Wb%t6N?
} h@{mcz
$`&zIz
docheckport() A-&XgOL
{ KCl85Wi'
mylogger_info "do check port $1" M(Tlk r
local port last_client count client total_count Fd;%wWY.zm
_ *.Im
D
if [ -z "$1" ] ; then M~ku
4ZP
mylogger_notice "docheckport() port not given" [v Tk*#Cl4
return g2%fla7r
fi v+vM:At4
G -V~6
port=$1 $]<wQH/?_
+GvP JI
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` bV&"jjEx
if [ $? != 0 ] ; then =mYwO=:D
mylogger_notice "netstat call failed"
`{1~]?-&
return y #{v\h
Cz
fi 0^83:C
^{
#echo $clientlist aw l3|k/
# reset new_block LaX<2]Tx:
new_block=0 [.'9Sw
count=0 h
f\/2Vl
total_count=0 2 GxkOch
last_client="" d]K
$0HY
for client in $clientlist ;~GBD]
do slQEAqG)B
#echo "client is $client" 2 QgD<
if [ -z "$last_client" ] ; then \DcO .`L
count=$((count+1)) hr W2#v
total_count=$((total_count+1)) V
t(s 4
last_client=$client 8`z
else # TZ`
if [ "$client" = "$last_client" ] ; then DN;|?oNZ
count=$((count+1)) gKP=@v%-
total_count=$((total_count+1)) 7$mB. \|
else [P`<y#J3F
mylogger_debug "$last_client $count connections" <+Gf!0i
if [ $count -ge $max_active_conn ] ; then E:y^= Y
mylogger_notice "client $last_client connection $count >= $max_active_conn" ,uPN\` .u8
blockclient $last_client $port c{j)beaS
fi s6k(K>P
l
count=1 c8Nl$|B
total_count=$((total_count+1)) ioUO 0
last_client=$client jLn|zK
fi B,] Af H
fi pV O{7I
done f!F5 d1N
# check the last client ZK h4:D
if [ ! -z "$client" ] ; then Z7I\\M
count=$((count+1)) 49ehj1Se
total_count=$((total_count+1)) J:@yG1VIp
mylogger_debug "$client $count connections" b94+GL U8b
if [ $count -ge $max_active_conn ] ; then = |E8z
u%
mylogger_notice "client $client connection $count >= $max_active_conn" juI)Do 2_
blockclient $client $port N'CW Sf.e
fi ~x^Ra8A
fi =@c;%x
mylogger_info "total connections on port $port: $total_count" "wCx]{Di
~14|y|\/
if [ $new_block = 1 ] ; then 86> @.:d
restartservice $port J50n
E~
fi hcM9Sx"!
} 0oZZLi
(*kKfg4Wj
docheckall() luW" |
{ KWM.e1(
# reset wakeup_time ?vFtv}@\
wakeup_time=$wakeup_time_max x .$cP
for port in $portlist wp83E,
do /N#=Tol
docheckport $port ;GKL[ t I"
if [ $new_block = 1 ] ; then 1M b[S{
# set wakeup_time shorter cause we found some abuse client <oi'yr
wakeup_time=$wakeup_time_min \4>w17qng
fi {|<yZ, ,p
done =[z P
} DWE DL[{
;kWWzg
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then s}-j.jzB{
firewall="ipchains" dkY JO!
fi JH u>\{8V
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if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then %YbL%i|U
firewall="iptables" 3t9
CN
) *
fi V7`vLs-
R NQq"c\
if [ -z "$firewall" ] ; then
F
=a
echo "Error: This machine does not have ipchains or iptables firewall support" ~d3@x\I?
exit 1 R4T@ ]l&W
fi P{BW^kAdH
W /*?y &
mylogger_info "firewall.sh v$myver ValueOf.com starting" X
@pm!c#
mylogger_info "Firewall is: $firewall" t: oQHhO?
mylogger_info "Port protected: $portlist" Jt #HbAY
mylogger_info "Max connection per ip: $max_active_conn" Zy.A9 Bh~
mylogger_info "Min time to check: $wakeup_time_min""s" _n !>*A!
mylogger_info "Max time to check: $wakeup_time_max""s" kM[!UOnC!<
mylogger_info "Timeout circle: $rule_timeout""s" 8 R7w$3pp\
mylogger_info "Output is logged to: $log_facility" 7 h0u7N
^Sj;~
# if new ip blocked at this check run? ,G-
new_block=0 )_n(u3'
# if new ip blocked at this timeout run? 9+$IulOvk
ever_block=0 H+-x.l`
# reset wakeup_time ~7PiIky.
wakeup_time=$wakeup_time_max sa _ J6 ~
U$y wO4.
lasttime=`date +%s` 3$Vx8:Rhdn
AWP grv /
while [ 1 ] ya5HAs
do Q`6hJgyL
curtime=`date +%s` l_$>$d
timediff=$((curtime-lasttime)) zUDXkG* Lv
#echo "timediff: $timediff" h-sO7M0E]
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then H=*0KX{
lasttime=$curtime avM8-&h
ever_block=0 6uKth mr
dotimeout @o*~\E<T
fi 9I q<*\V 4
docheckall \ykA7Y%
mylogger_info "sleep for $wakeup_time""s" K7.ayM 0
sleep $wakeup_time [` }w 7
done f Ayh9
;K|K]c
^c/3 !"wK
b<#zgf
1. 说明 t9*e"QH
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， [{ R>'~
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 __s'/ 6u
该程序可以同时保护多个端口 ` ~^My~f
V @s93kh
2. 安装 ntB#2S
tar zxf firewall-1.0b.tar.gz BFP@Yn~k
cd firewall-1.0b Vr"'O6
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh s]`6u yW"
n@h$V\&\iM
3. 配置 yS:w>xU @<
主要配置项目如下： B0p;Zh
# 最小检查周期，缺省为120秒 T][c^K*
wakeup_time_min=120 v$x)$ /]n
.I]v
D#o
# 最大检查周期，缺省为300秒 -^t.eZ*|
wakeup_time_max=600 7QZy d-
5 8L@:>"
# 重设防火墙状态的时间，缺省为3600秒 /X0<2&v
rule_timeout=3600 xaB#GdD
nRw.82eK.
# 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) @MFE Bc}
# 一般的网络攻击都是针对80和25，又以80居多 Er8F_,M+
portlist="80 25"
._;It198f
w)qmq
# 每个ip可占用的最大活动（Established）连接数 6Fk[w H 7
max_active_conn=8 EG &me
P,F 5Hf
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 n!~QC
# 如果用的是ipchains，可以忽略此项 KyDd( 'i
iptables_chain_name="RH-Lokkit-0-50-INPUT" }TuMMO4+
CN-4FI)1D9
# 日志输出目标 3BLH d<
log_facility="local0" 2v4&'C
e$Y 7V
**** 关于检查周期 **** tpeMq -
程序定义了两个检查周期，如果上次检查中屏蔽了某个IP，则程序会更频繁地检查连接情况，反之则等待更长时间。通过检查周期 JlE+CAny
的动态调整，可以有效调度在遭受攻击和正常状态下程序的运行次数。 7~P!Z=m^^f
c$u#U~~
**** ipchains vs iptables **** LS# _K -
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 K&dc< 4DC
/etc/sysconfig/iptables都没有检测到，则报错退出。 u V'C_H
_$HCNFdh
**** 日志输出 ****
$SniQ
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 RJN
LcIm
中加入一条： ;t@^Z_z,CR
local0.* /var/log/firewall.log K
#J O#
然后重新启动syslog s>>lf&7
/etc/init.d/syslog restart b+CvA(*
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 q^@*k,HG
A/j'{X!z
4. 运行 ^*~4[?]S
/usr/prima/sbin/firewall.sh & d+8|aS<A
L>57eF)7
范例输出： j2n
4; m
*** firewall.sh v1.0b ValueOf.com*** Y[;Z7p
Firewall is: ipchains .
ve a [
Port protected: 80 25 'w\Gd7 E
Max connection per ip: 8 K5+ONA<c
Min time to check: 120s *NI hYg6
Max time to check: 300s % 9t=Iu*
Timeout circle: 3600s 9v}vCg
Output is logged to: local0 h&b s`
Psjk
7\
察看/var/log/firewall.log，可以看到： ;AarpUw'
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 TiI3<.a!
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 (i^<er q
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 NX<Q}3c C
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 [>kzQY T[
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 _qS4Ns/4s
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 X.ZY1vO
-/6Ms%O
5. 停止 yrrP#F
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 xa%2w]
# ps auxww|grep firewall.sh =Xb:.
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh t-J\j"~%+
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh \MmKz^tO
第一行即firewall.sh的进程，用kill命令： zLVk7u{e
# kill 27932 DYL\= ya1
[1] Terminated /usr/prima/sbin/firewall.sh C;rK16cn
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
