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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 \rpu=*gt
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#!/bin/sh D5 26X0
# this program is used to check tcp/ip connections &(K*
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# and block those ip with excessive connections Gqs8$[ o
W46sKD;\^W
# my version /ZczfM\
myver="1.0RC1" 3Ry? {m^
aAX 8m
# wake up every 120s if last check found abuse client -Xj+7}4
wakeup_time_min=120 eq"~b
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# wake up every 300s if last check found no abuse client 3}H94H)]a
wakeup_time_max=300 k8h$#@^
?znSA
>
# rule timeout 3600s cD{[rI
E3
rule_timeout=3600 Jzr(A^vwo
~d
} -
# check port list bN qjjg
portlist="80" pdE=9l'
MOj 0"x)
# max established connection per ip Tj.;\a|d
max_active_conn=8 D3I;5m`_
7OT}V}iP
# iptables chain name Jx 'p\*
iptables_chain_name="RH-Lokkit-0-50-INPUT" f$P pFSY
4
4Jw0m#UN1
# log facility I@[.W!w
log_facility="local0" N 4Dye c\
{4#'`Eejj
# Block policy B=9|g1e
ipchains_block_policy="DENY" Fm*O&6W\@A
iptables_block_policy="REJECT" p#3P`I>ZrT
%[ RLc[pB
# myself aG,N>0k8
myself=`basename $0` #A?U_32z/2
oZ!rK/qoA
mylogger_info() [Q)lJTs
{ m%m8002
logger -p $log_facility.info -t $myself $@ 2>/dev/null ]{dg"J
} V7 c7(G
i5|!M IY
mylogger_debug() -p9|l%W
{ J8( v 65
logger -p $log_facility.debug -t $myself $@ 2>/dev/null {ImZ><xe/
} J}lBK P:-*
\Z<' u;
mylogger_notice() m ?LOd9
{ A"p7N?|%
logger -p $log_facility.notice -t $myself $@ 2>/dev/null h@/c76}f6p
} ,D>$N3;
N }Z"$4
dotimeout() )9J&M 6LX
{ Ql!$e&A|l
mylogger_info "reset firewall when timeout arrives" @ScH"I];uA
case "$firewall" in 1+v)#Wj
ipchains) aw {?UvL&
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null ho;Km
if [ $? = 0 ] ; then jb GP`b1_
mylogger_info "ipchains restarted" H/Y ZwDx,i
else rl[&s\[
mylogger_notice "ipchains restart failed" 9psD"=/"
fi 8E ^yHd4Y
;; 0k0 y'1SL
iptables) MW6 d-
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null rx
CSs
if [ $? = 0 ] ; then A9!%H6
mylogger_info "iptables restarted" Zw` Xg@;xP
else X~G!{TT_x6
mylogger_notice "iptables restart failed" 2mWW0txil
fi /9QI^6& SX
;; 7lqj" o(
*) 1Y_Cd
mylogger_notice "neither ipchains nor iptables" ZC
@sUj"
;; XL1v&'HLV
esac ~8o's`
m\)z& hv<r
} rp (nGiI
PTXy:
>]M
blockclient() _p"
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{ a 2 e-Q({
if [ -z "$1" ] || [ -z "$2" ]; then s+8
v7ZJ
mylogger_notice "blockclient() missing client or port to block" lED-Jo2
return DJ2EV^D+P
fi ?kqo~twJ
local ip port w O;\,zU
6hv4D`d ;o
ip=$1 SQ9s
port=$2 9
,=7Uh# 7
`9}\kn-</8
case "$firewall" in nw){ }g
ipchains) i Tg?JoE2
mylogger_notice "blocking $1 to $2 via ipchains" Hr |De8#f
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` z=J%-Hq>
if [ -z "$found" ] ; then 0!!b(X(
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" g}
7FR({b
mylogger_debug "cmd: $cmd" 9
tvLj5~
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` 2 UU5\
jV6
if [ $? != 0 ] ; then M n7nS:
mylogger_notice "$cmd call failed" -`x$
a&}
return Fsv:SL+5
fi f< bc8Lp
new_block=1 } YH@T]O}
ever_block=1 P#H|at
else /^v?Q9=Y
mylogger_info "$ip already blocked to $port" )xYv$6=
fi 28J
; 9
;; x;ym_UZ6e
iptables) !4cO]wh5
mylogger_notice "blocking $1 to $2 via iptables" H)tnxD0)
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` *vqlY[2Ax
if [ -z "$found" ] ; then
[zmx
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" 22lC^)`TE
mylogger_debug "cmd: $cmd" <+ 0cQq=2
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` ENW>bS8 e`
if [ $? != 0 ] ; then Rd7[e^HSN
mylogger_notice "$cmd call failed" JbN@A X:%
return 6z3 Yq{1
fi #Bq.'?c'~
new_block=1 HPJ\]HV(
ever_block=1 C;7?TZ&x w
else l1BbL5#1Q>
mylogger_info "$ip already blocked to $port" %H OMX{~}#
fi Esh3 cn4
;; ^~~&[wY
*) ` Q C
mylogger_notice "neither ipchains nor iptables" q2v:l
SFY
;; 3J t_=!qlo
esac b=[ gK|fu
} t<S]YA~N'
bH+x `]{A
restartservice() ds@X%L; _
{ H
sr Iw
local service E + wd9/;
if [ -z "$1" ] ; then q FEGV+
mylogger_notice "no port given to see which service to be restart" .Cv0Ze
return C'8v\C9Ag
fi m# #( uSh
I,4t;4;Zk
case "$1" in VrL==aTYXs
80) e.pm`%5bO
service="httpd" 0Y rdu,c
;; !e~Yp0gX#
25) sc
mn-4j'{
service="postfix" F O"8B
;; fQ>=\*b9x^
110) `J* ~B
service="courier-pop3d" OO%< ~H
;; a*4"j2j v
21) 3$Ecq|4J:
service="muddleftpd" ^qNh)?V?]I
;; *69 yB
53) y!6+jrI
service="named" ,:yv T6)p
;; uP,{yna(
3306) ml7nt 0{
service="mysqld" :,.g_@wvG
;; KP )BD;
esac || |uTfrJ
if [ ! -z "$service" ] ; then
& t b
/etc/init.d/$service restart 1>/dev/null 2>/dev/null $`q8-+
{
if [ $? = 0 ] ; then e|w H5(V
mylogger_notice "$service restarted" 6;/>asf
else \Ol3kx|
mylogger_notice "$service restart failed" ?3 :OPP `s
fi /m,0H)w1
fi xl5n(~g)p
} @g|E b}t
JyPsRpi\
docheckport() Mwdh]I,#
{ yQw j [
mylogger_info "do check port $1" j!r 4 p,
local port last_client count client total_count VdpkE0
mT57NP
if [ -z "$1" ] ; then %N
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mylogger_notice "docheckport() port not given" #plwK-tPR
return G~ZDXQ>5CP
fi 66\0JsT?3
DM6oMT
port=$1 fShf4G_w\
S=O/W(ZB
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` 2, Y8ML<
if [ $? != 0 ] ; then `Rj<qz^7
mylogger_notice "netstat call failed" Kb0O
auW
return b5YjhRimS
fi ZTG*|
#echo $clientlist 8
?'
]W\)
# reset new_block * [*#cMZ
new_block=0 zypZ3g{v z
count=0 9vL`|`Vau
total_count=0 EWN$ILdD
last_client="" /vP
h_1
for client in $clientlist [!{*
)4$6
do M;W{A)0i1
#echo "client is $client" / /qTMxn
if [ -z "$last_client" ] ; then ~Dr/+h:^\
count=$((count+1)) [ (t goh/
total_count=$((total_count+1)) D8_m_M| P
last_client=$client i o
cr
else </< _e0
if [ "$client" = "$last_client" ] ; then ?[Q;275
count=$((count+1)) =HP_IG_
total_count=$((total_count+1)) v:CYf_
else EA75
D&>I
mylogger_debug "$last_client $count connections" BW :&AP@B
if [ $count -ge $max_active_conn ] ; then |LKhT4rE
mylogger_notice "client $last_client connection $count >= $max_active_conn" -]5dD VSO
blockclient $last_client $port d f
#DKV:
fi '2z o
count=1 t=S94 ^g
total_count=$((total_count+1)) /{7x|ay]
last_client=$client +n9&q#ah
fi ,{itnKJC
fi {^9,Dy_D
done gq[}/E 0e
# check the last client 0$ &Z_oJ
if [ ! -z "$client" ] ; then :<ujk
count=$((count+1)) n5UcivyX
total_count=$((total_count+1)) GfQMdLy\Z
mylogger_debug "$client $count connections" EP I mh
if [ $count -ge $max_active_conn ] ; then
30FYq?
mylogger_notice "client $client connection $count >= $max_active_conn" ]S,I}NP
blockclient $client $port \EYhAx`2
fi I=f1kr
pR
fi LLgN%! &
mylogger_info "total connections on port $port: $total_count" BEPDyy
&#.XLe\y
if [ $new_block = 1 ] ; then 0g]ABzTn
restartservice $port Dr(.|)hv[&
fi l:Ci'=
} 1ErH \!
k>VP<Zm13
docheckall() CN brXN
{ 6xnJyEQUM
# reset wakeup_time K + T`'J4
wakeup_time=$wakeup_time_max Vize0fsD
for port in $portlist 5?9}^s4
do S)g5T u)
docheckport $port MrOW&7
if [ $new_block = 1 ] ; then Y
z-b~D/=}
# set wakeup_time shorter cause we found some abuse client + 6r@HK`,t
wakeup_time=$wakeup_time_min XFK$p^qu
fi IA8kq =W
done 2U~oWg2P
} s)/i_Oe$\
Qg9{<0{u
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then we bT
firewall="ipchains" T^A:pL1
fi 0pkU1t~9
Qt>yRt
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then oVC~RKA*
firewall="iptables" K3
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#
fi m}
Yf6:cr
OY"{XnPZ
if [ -z "$firewall" ] ; then ",Q \A I
echo "Error: This machine does not have ipchains or iptables firewall support" Grjm 9tbX}
exit 1 #+Vv f
fi uY
"88|
PFEi=}Y@((
mylogger_info "firewall.sh v$myver ValueOf.com starting" IUu [`\b=
mylogger_info "Firewall is: $firewall" :
O//A6 v
mylogger_info "Port protected: $portlist" /}M@
@W
mylogger_info "Max connection per ip: $max_active_conn" ,T&B.'cq
mylogger_info "Min time to check: $wakeup_time_min""s" ,qv z:a
mylogger_info "Max time to check: $wakeup_time_max""s" [eWB
vAiW
mylogger_info "Timeout circle: $rule_timeout""s" _v2FXm
mylogger_info "Output is logged to: $log_facility" [ HNGTde&
]^Q`CiKd
# if new ip blocked at this check run? "F %cn@l
new_block=0 e?Cbl'
# if new ip blocked at this timeout run? zD) 2af
ever_block=0 n$b/@hp$z
# reset wakeup_time ?"sk" {
wakeup_time=$wakeup_time_max dnNc,l&g
5jYRIvM[Q~
lasttime=`date +%s` ^'FY!^dE
xQJdt $]U@
while [ 1 ] <[a9"G 7
do z),l&7
curtime=`date +%s` vQIoj31
timediff=$((curtime-lasttime)) #Va@4<4r
#echo "timediff: $timediff" k# &y
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then 40q8,M
lasttime=$curtime ^PWZ1.T
ever_block=0 &:{| nDT_2
dotimeout _Thc\{aV#
fi <'B` b
docheckall wet kmd
mylogger_info "sleep for $wakeup_time""s" (6JD<pBm
sleep $wakeup_time Ye1P5+W(
done $9ON 3>
TXy*- <#vR
R8HA X
p]pFZ";70
1. 说明 v3aiX
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， `CHgTkv
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。 x28B z*O
该程序可以同时保护多个端口 9prG@
o*dhks[
2. 安装 ];Z_S`JR
tar zxf firewall-1.0b.tar.gz rtUd L,Hx
cd firewall-1.0b !)&-\!M>
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh 'l<kY\I!%
flmcY7ZV
3. 配置 orL7y&w(v:
主要配置项目如下： ,cbP yg
# 最小检查周期，缺省为120秒 + ^~n09
wakeup_time_min=120 r%xNfTa
Q>z 0?%B
# 最大检查周期，缺省为300秒 %`g qV9a
wakeup_time_max=600 OG ae]O<
4V[+6EV
# 重设防火墙状态的时间，缺省为3600秒 Wc+ e>*
rule_timeout=3600 U>:p` @
@Yt[%tOF+
# 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) ,',fO?Qv'
# 一般的网络攻击都是针对80和25，又以80居多 ^TB%| yZ _
portlist="80 25" eQYW>z'%,
t,RR\
S
# 每个ip可占用的最大活动（Established）连接数 67f#Z&r2k
max_active_conn=8 /S|Pq!4<
eBBh/=Zc
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 a0. )zgWr
# 如果用的是ipchains，可以忽略此项 9f e~Q%x=u
iptables_chain_name="RH-Lokkit-0-50-INPUT" B\N,%vsx#U
znu?x|mV
# 日志输出目标 y+X%qTB
log_facility="local0" ^>]p4Q3 6
u6|7P<HUfb
**** 关于检查周期 **** sd#a_
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 ,wnF]K 2D0
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。 <;_X=s`f,
VE{t]>*-u
**** ipchains vs iptables **** =SLJkw&w6
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 q
\0>SG
/etc/sysconfig/iptables都没有检测到，则报错退出。 IWKQU/l!
Z=wLNm H
**** 日志输出 **** }X }f X#[
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 Soq
'B?>
中加入一条： h5B 'w
local0.* /var/log/firewall.log yP uT%H&i
然后重新启动syslog _%"/I96'
/etc/init.d/syslog restart v')T^b
F@
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 r=s2wjk
Z?1.Y7Npr
4. 运行 opdi5 e)jK
/usr/prima/sbin/firewall.sh & .y[=0K:
Hz+edM UL
范例输出： +d Ig&}Tr
*** firewall.sh v1.0b ValueOf.com*** J
Wof<D,
Firewall is: ipchains XCQ =`3f
Port protected: 80 25 <C]s\ "o-`
Max connection per ip: 8 \$GlB+ iCx
Min time to check: 120s u9sffX5x[J
Max time to check: 300s m$0T" `AP`
Timeout circle: 3600s c00a;=ji
Output is logged to: local0 *G2p;n=2
WVp14Z?k
察看/var/log/firewall.log，可以看到： >*k3D&
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 So,EPB+
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 `3\5&B f
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 r S8/_'
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 Ws.F=kS>h
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 (4x`/
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 1kvBQ1+
U
$e -e/
5. 停止 )t&j0`Yq
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 R\
<HR9
r
# ps auxww|grep firewall.sh .@.O*n#K
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh K'Bq@6@C g
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh D3|y|Dr
第一行即firewall.sh的进程，用kill命令： 68W&qzw.[r
# kill 27932 ~bg?V0
[1] Terminated /usr/prima/sbin/firewall.sh 7 S(5\9
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
