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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 ~ Tbj
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#!/bin/sh RrU BpqA
# this program is used to check tcp/ip connections N7E$G{TT
# and block those ip with excessive connections ljl^ GFo
ARcB'z\r
# my version ] Q]W5WDe:
myver="1.0RC1" "ju6XdZ
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# wake up every 120s if last check found abuse client iq(
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wakeup_time_min=120 rZ8`sIWQt
W9NX=gE4
# wake up every 300s if last check found no abuse client dy_:-
2S
wakeup_time_max=300 %p%%~ewmx
n ; {76Q
# rule timeout 3600s LL:_L<
rule_timeout=3600 4apL4E"r
8M!:N(a
# check port list <b,~:9*?
portlist="80" [eTSZjIN7
8WnwQ%;m?
# max established connection per ip ]U"94S U:)
max_active_conn=8 1GzAG;UUo6
-GxaV #{
# iptables chain name Hh+
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iptables_chain_name="RH-Lokkit-0-50-INPUT" c/sC&i;%O
p5G? N(l
# log facility K6R.@BMN
log_facility="local0" p, #o<W
J{Q|mD=
# Block policy % >=!p
ipchains_block_policy="DENY" ZHa"isl$e
iptables_block_policy="REJECT" E>K!Vrh-L
{
;2PL^i
# myself hIT+gnh h
myself=`basename $0` i{`:(F5*
0)gdB'9V_
mylogger_info() RCpR3iC2
{ ~sh`r{0
logger -p $log_facility.info -t $myself $@ 2>/dev/null 'tH_ p
} c24dSNJg,
r 8 RoE`/T
mylogger_debug() F'21jy&
{
< J`0
logger -p $log_facility.debug -t $myself $@ 2>/dev/null %l Gl,me H
} tVN
YpVD2.jy
mylogger_notice() bE ! G JZ
{
R[D{|K@"
logger -p $log_facility.notice -t $myself $@ 2>/dev/null 9d x/hFA
} <eWf<
Hx?;fl'G%
dotimeout() e w$ B)W
{ #V~me
mylogger_info "reset firewall when timeout arrives" 0Qf,@^zL*
case "$firewall" in ?67Y -\}
ipchains) GjvOM y
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null I&x=
;
if [ $? = 0 ] ; then at,XB.}Z]
mylogger_info "ipchains restarted" 8;JWK3Gv
else hcsP2
0s
mylogger_notice "ipchains restart failed" A P?R"%
fi YJT&{jYi
;; iP ->S\
iptables) . YAT:;L
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null
mn"G_I
if [ $? = 0 ] ; then 2*laAB
mylogger_info "iptables restarted" f<d`B]$(
else z]_wjYn Z
mylogger_notice "iptables restart failed" *a v<E
fi f@wquG'
;; )Q&(f/LT
*) c t
Z uA+
mylogger_notice "neither ipchains nor iptables" FpmM63$VN[
;; 3Ei#q+7
esac _)3|f<E_t)
Q4#m\KK;i9
} -P$PAg5"2
N X*Q
F+
blockclient() ZB=
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{ 3 w*R&
if [ -z "$1" ] || [ -z "$2" ]; then Q%`@0#"]Sv
mylogger_notice "blockclient() missing client or port to block" X:"i4i[}{9
return [6Izlh+D
fi SaO} e
local ip port ]g 3JZF-
@1roe
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ip=$1 nfbR
P t
port=$2 ,q`\\d
I3L<[-ZE
case "$firewall" in 5{X<y#vAC0
ipchains) *w`sM%]Rq
mylogger_notice "blocking $1 to $2 via ipchains" vm8eZG|
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` &jJL"gq"
if [ -z "$found" ] ; then ^}=,g
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" \';gvr|
mylogger_debug "cmd: $cmd" dFB]~QEK
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` & '`g#N
if [ $? != 0 ] ; then eu-*?]&Di
mylogger_notice "$cmd call failed" %YscBG
return )qw &%sO +
fi )m T<MkP
new_block=1 v@L;x [Q
ever_block=1 6<QQ@5_
else QA
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mylogger_info "$ip already blocked to $port" j</: WRA`]
fi %ntRG !
;; T.BW H2gRP
iptables) 6%_nZvRv
mylogger_notice "blocking $1 to $2 via iptables" K+3=tk]W9u
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` V b ?oJhR
if [ -z "$found" ] ; then \ ~$#1D1f
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" &j"?\f?
mylogger_debug "cmd: $cmd" oD .Cs'
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` 583|blL
if [ $? != 0 ] ; then 1>h]{%I
mylogger_notice "$cmd call failed" z Rr*7G
return ]{@-HTt
fi K w ]=
new_block=1 Wh*uaad7
ever_block=1 @I?=<Riu
else n{mfn *r.
mylogger_info "$ip already blocked to $port" ?Z/
V~,
fi eD6fpe\
(
;; !%c\N8<>GD
*) oUU1+F-
mylogger_notice "neither ipchains nor iptables" |@d\S[~ ^G
;; &V/Mmm T
esac M .mfw#*
} eeB{c.#
- [.[>&`/
restartservice() 4|?;TE 5
{ 3a'<*v<xw
local service 4,DeHJjAlE
if [ -z "$1" ] ; then X'iWJ8
mylogger_notice "no port given to see which service to be restart" &tj!*k'
return FQ\h4` >B
fi Y76gJ[y jn
N(yz k_~
case "$1" in gg2( 5FPP
80) sfl<qD+?
service="httpd" 6Z"X}L,*
;; z dam^o
25)
Z *x'+X
service="postfix" 4j^
@wV'
;; r9?Mw06Wc5
110) Jln:`!#fDf
service="courier-pop3d" TB31-
()
;; 3ckclO\|>
21) 493*{
service="muddleftpd" h M! a_'
;; V !~wj
53) 3 Jn ;}
service="named" f
_:A0
;; )boE/4
3306) 'V>-QD%1
service="mysqld" }x ,S% M-
;; n+R7D.<q!!
esac h{qgEIk&
if [ ! -z "$service" ] ; then yB!dp;gM{
/etc/init.d/$service restart 1>/dev/null 2>/dev/null m]&SN z=
if [ $? = 0 ] ; then 7d\QB (~
mylogger_notice "$service restarted" ;kKyksxlD
else 4<v&S2Yq
mylogger_notice "$service restart failed" qe\5m.k
fi NHE 18_v5
fi ~$J2g
} ~.|_ RdN
U $UIN#
docheckport() 5:?! =<=
{ 2`-Bs
mylogger_info "do check port $1" 2Khv>#l
local port last_client count client total_count -Qe'YBy:
d_
P` qA
if [ -z "$1" ] ; then nr3==21Om4
mylogger_notice "docheckport() port not given" H,NF;QPPC
return QsW/X0YBv
fi "Y.y:Vv;
GN>@ZdVG}#
port=$1 Ts
x>&W C
"gwSJ~:ds
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` `0R./|bv\I
if [ $? != 0 ] ; then i -&yH
mylogger_notice "netstat call failed" Xnh8e
return @%SQFu@FJ
fi 6H|S ;K+
#echo $clientlist fXB0j;A
# reset new_block %
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new_block=0 B7%U_F|m
count=0 LgYq.>Nl9
total_count=0 1Y Mh1+1
last_client="" =\d ?'dII:
for client in $clientlist l;V173W=&
do &.ACd+Cd
#echo "client is $client" mA} "a<0
if [ -z "$last_client" ] ; then ctV,Q3'
Z
count=$((count+1)) H[|~/0?K
total_count=$((total_count+1)) L=h'Qgk%
last_client=$client hzC >~Ub5
else t:c.LFrF
if [ "$client" = "$last_client" ] ; then @|)Z "m7
count=$((count+1)) 8$|=P!7EO
total_count=$((total_count+1)) 'H!
XUtFs"
else =":,.Ttq41
mylogger_debug "$last_client $count connections" >i
O!*&Y>
if [ $count -ge $max_active_conn ] ; then :i7;w%B
mylogger_notice "client $last_client connection $count >= $max_active_conn" GH
xp7H
blockclient $last_client $port yppo6 HGD
fi 5M_H
NWi4
count=1 ,Lt[\_
total_count=$((total_count+1)) a}u Sm/S
last_client=$client Ca3~/K
rM
fi
=rK+eG#,
fi v9UD%@tZ
done Q5_o /wk
# check the last client M#[{>6>iE
if [ ! -z "$client" ] ; then E .>4C[O
count=$((count+1)) yCX?!E;La
total_count=$((total_count+1)) 8J D,u
mylogger_debug "$client $count connections" VD\=`r)nT
if [ $count -ge $max_active_conn ] ; then A +)`ZTuO
mylogger_notice "client $client connection $count >= $max_active_conn" zv"Z DRW
blockclient $client $port I`p ;F!s
fi 5 u0HI
fi ;({W#Wa
mylogger_info "total connections on port $port: $total_count" 1!gbTeVlY
! v0LBe4
if [ $new_block = 1 ] ; then C>w|a
restartservice $port )>-
=R5ZV
fi eGH aY4|
} O1mK e%'|
xZv# Es%#
docheckall() _ORvo{[:
{ '08=yqy4N
# reset wakeup_time @{O`E^}-D
wakeup_time=$wakeup_time_max :4%k9BGAj"
for port in $portlist #
4PVVu<
do
( ICd}
docheckport $port \} :PLCKT
if [ $new_block = 1 ] ; then ,nB5/Lx
# set wakeup_time shorter cause we found some abuse client q%?in+l
wakeup_time=$wakeup_time_min 3;s\OW`
fi w: Kl6"c
done NPe% F+X
} EJNU761
w=J3=T@TD
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then ;VO:ph 4Aj
firewall="ipchains" b`O'1r\Y;
fi r?
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8q}q{8
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then $@"g^,n
firewall="iptables" RuV
GG)
fi -I,$_
'u |c
if [ -z "$firewall" ] ; then "mvt>X
echo "Error: This machine does not have ipchains or iptables firewall support" DG:Z=LuJr
exit 1 Q| ?L*Pq2I
fi (S\[Y9
SmSH 2m-
mylogger_info "firewall.sh v$myver ValueOf.com starting" 'Xq| Kf (
mylogger_info "Firewall is: $firewall"
DwE[D]7o
mylogger_info "Port protected: $portlist" !58@p LJw
mylogger_info "Max connection per ip: $max_active_conn" ^N{h3b8
mylogger_info "Min time to check: $wakeup_time_min""s" 54 R#W:t
mylogger_info "Max time to check: $wakeup_time_max""s" ' =8d?aeF
mylogger_info "Timeout circle: $rule_timeout""s" MJ
[m
mylogger_info "Output is logged to: $log_facility" 41?HY{&2
B; h"lv
# if new ip blocked at this check run? 9c,'k#k
new_block=0 Jgd'1'FOs
# if new ip blocked at this timeout run? V_}"+&W9
ever_block=0 |AU~ _{H
# reset wakeup_time RF53J yt
wakeup_time=$wakeup_time_max ryUQU^v
peuZ&yK+"
lasttime=`date +%s` [H^z-6x:0
9FY Uo
while [ 1 ] :L@?2),
do n QZwC
curtime=`date +%s` 9YQb &
timediff=$((curtime-lasttime)) Z|j> gq
#echo "timediff: $timediff" ^-Kf']h U
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then jaMjZp;{
(
lasttime=$curtime dx{bB%?Y\=
ever_block=0 sF?TmBQ*
dotimeout j0S# >t
fi u jq =F
docheckall {9;CNsd
mylogger_info "sleep for $wakeup_time""s" dIa+K?INX
sleep $wakeup_time (X1e5j>Ru
done Ou!2 [oe@M
xH(lm2kvT
}c`"_L
AFDq}*2Qb
1. 说明 YYl 4" l
firewall.sh是一个shell脚本程序，每隔一段时间检查tcp连接的统计信息，如果来自某个ip对某个端口的活动连接超过规定的最大数量， kmsb hYM)
则自动将该IP对该端口的访问屏蔽，并重新启动相应的服务。再每隔一段时间，会重设防火墙到初始状态。 &5spTMw8
该程序可以同时保护多个端口 st3l2Q
QP^Cx=
2. 安装 otl0J Ht*+
tar zxf firewall-1.0b.tar.gz % X+:o ]T
cd firewall-1.0b %C'?@,7C
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh W*4-.*U8a
6C^
D#.S
3. 配置 FLCexlv^
主要配置项目如下： FQ2
# 最小检查周期，缺省为120秒 /W30~y
wakeup_time_min=120 6BHXp#
#z
vNY{j7l/W
# 最大检查周期，缺省为300秒 bv9]\qC]T<
wakeup_time_max=600 }6 }l7x
gQelD6 c
# 重设防火墙状态的时间，缺省为3600秒 D/B8tf+V
rule_timeout=3600 y8Z_Itlf
]^n7
# 保护的端口列表，缺省为80和25，支持的其他端口包括21(ftp), 110(pop3), 53(named), 3306(mysql) R'`qK c
# 一般的网络攻击都是针对80和25，又以80居多 "f 2$w
portlist="80 25" Nk
8 B_{
mPK:R^RjG&
# 每个ip可占用的最大活动（Established）连接数 A5 RN5`}
max_active_conn=8 W$;,CU.v
V`d,qn)i
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 \0I _<
# 如果用的是ipchains，可以忽略此项 Y>T-af49
iptables_chain_name="RH-Lokkit-0-50-INPUT" GPv1fearl
T_
<@..C
# 日志输出目标 D~iz+{Q4
log_facility="local0" $q{!5-e
syj0.JD
**** 关于检查周期 **** :$|HNeDO
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 ;_I8^? d
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。 M,,bf[p$
E h vX)s
**** ipchains vs iptables **** E \EsWb
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
aEWWP]
/etc/sysconfig/iptables都没有检测到，则报错退出。 A#<? 4&
)
7@ `ut
**** 日志输出 **** ~?Pw& K2
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 /NFj(+&g+
中加入一条： $G+@_'
local0.* /var/log/firewall.log ,HV(l+k {|
然后重新启动syslog
IdYt\^@>
/etc/init.d/syslog restart xn(kKB .
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 U&OJXJd j
g2ixx+`?|:
4. 运行 ]^7@}Ce_
/usr/prima/sbin/firewall.sh & `25yE/
Vwf$JdK%&l
范例输出： <2x^slx)?
*** firewall.sh v1.0b ValueOf.com*** *#|&JIEsi
Firewall is: ipchains ((;!<5-`s
Port protected: 80 25 @n /nH ?L
Max connection per ip: 8 tw/dD +
Min time to check: 120s k%#EEMh
Max time to check: 300s lgy <? LI\
Timeout circle: 3600s 8/cX]J
Output is logged to: local0 AeM^73t
MK k\
u9
察看/var/log/firewall.log，可以看到： RSRS wkC
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 \?-<4B 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 yx[/|nZDC4
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 Mb}QD~=M
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 8/#A!Ww]
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 I$G['` XX/
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 ^uc =f2=>,
`/+>a8
5. 停止 ^z*t%<@[Q
先用ps命令察看firewall.sh进程的进程号，然后用kill命令将其终止，如 ebhXak[w
# ps auxww|grep firewall.sh khxnlry
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh
jB2[(
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh K5h
第一行即firewall.sh的进程，用kill命令： <n$'voR7]
# kill 27932 T'9'G
M
[1] Terminated /usr/prima/sbin/firewall.sh RtS+<^2a;
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
