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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 QpZ CU]
5.3=2/
#!/bin/sh + XP9=U*g
# this program is used to check tcp/ip connections $"[5
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# and block those ip with excessive connections mW&hUP Rx
>j$y@"+
# my version zIT)Hs5
myver="1.0RC1" (764-iv(
dFVx*{6
# wake up every 120s if last check found abuse client g<(\#F}/
wakeup_time_min=120 {\
62c;.
o/ ~Rf1
# wake up every 300s if last check found no abuse client @zGz8IF
wakeup_time_max=300 { usv*Cm
( @&+?A"6`
# rule timeout 3600s D@
4sq^|2
rule_timeout=3600 2{;~Bg d
> t~2
# check port list u]uZc~T
portlist="80"
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e OUv#F
# max established connection per ip 9T;DF UM
max_active_conn=8 '74*- y d
H05xt$J
# iptables chain name \;bDDTM
iptables_chain_name="RH-Lokkit-0-50-INPUT" -4!S?rHwd+
/|#";QsPN
# log facility tx _h1[qi
log_facility="local0"
'LW~_ \
9[ ,+4&wX7
# Block policy 1}E R+;If
ipchains_block_policy="DENY" g
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iptables_block_policy="REJECT" }>$3B5}
-a\[`JHi
# myself h}&1
7M
myself=`basename $0` Tx:S{n7&
EAZLo;
mylogger_info() fb|%) A=
{ y*H rv
logger -p $log_facility.info -t $myself $@ 2>/dev/null iOXs j
}
Lm1
-
/Xf_b.ZM&
mylogger_debug() JrNqS[c/
{ *iiyU}x
logger -p $log_facility.debug -t $myself $@ 2>/dev/null LVe [N-K
} oc PM zq-
G7SmlFn?
mylogger_notice() K'U8f t*_
{ P&sYS<9q
logger -p $log_facility.notice -t $myself $@ 2>/dev/null [DD#YL\P
} j
e WI<ms
^E]y >Y
dotimeout() n xhn|v
{ >SHP,><H/
mylogger_info "reset firewall when timeout arrives" ~%?LFR'
case "$firewall" in m5
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ipchains) ,t@B ] ll
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null @&9, 0 x
if [ $? = 0 ] ; then wu~?P`
mylogger_info "ipchains restarted" g]Z@_
else WPDi)U X
mylogger_notice "ipchains restart failed" K;l
xPM]
fi pSdtA v
;; sUz,F8 G
iptables) cP^c}e*;NS
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null q Qp;i{X
if [ $? = 0 ] ; then P2 fiK
mylogger_info "iptables restarted" J936o3F_
else EI8KKo *
mylogger_notice "iptables restart failed" aSt:G*a"
fi O&evv8 6L
;; X86r`}
*) ~S~4pK
mylogger_notice "neither ipchains nor iptables" qCy
SL lp0
;; Kb~i9x&
esac GQ6~Si2
,m[#<}xXA
} KJi8LM
N)
'|l0x0
blockclient() ?/}-
&A"
{ !|~y f3
if [ -z "$1" ] || [ -z "$2" ]; then p9[gG\
mylogger_notice "blockclient() missing client or port to block" 4P?R "Lk
return $_ O;yz
fi .o)
local ip port D-Q54"^3
U*\ 1d
ip=$1 F7\nG}#s
port=$2 >6gduD!6I
gg@Ew4L&
case "$firewall" in " nLW vV1
ipchains) E=]$nE ]b
mylogger_notice "blocking $1 to $2 via ipchains" %afz{a5
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` KJW^pAj$B
if [ -z "$found" ] ; then ;R7+6
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" VEx
)
mylogger_debug "cmd: $cmd" Q1RUmIe_&
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` ZJV;&[$[
if [ $? != 0 ] ; then G \|P3j
mylogger_notice "$cmd call failed" #YK=e&da
return T1c & 3
fi b&!x.+d-z
new_block=1 P.3kcZ
ever_block=1 EO\- J-nM
else 3+8{Y
mylogger_info "$ip already blocked to $port" y6&o+; I$[
fi r
TK)jxklX
;; * R8P brN
iptables) R]N"P:wf@
mylogger_notice "blocking $1 to $2 via iptables" ]U ul~T
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` {i)FDdDGD
if [ -z "$found" ] ; then })C}'!+]
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" A>rN.XW
mylogger_debug "cmd: $cmd" G
! U
`8R
`iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` 'h>CgR^NM1
if [ $? != 0 ] ; then Oe&gTXo
mylogger_notice "$cmd call failed" b"eG8
return $|K-wN[
fi r GQY
new_block=1 CP J%<+4%b
ever_block=1 bl[2VM7P
else G`z=qaj
mylogger_info "$ip already blocked to $port" &'c&B 0 j
fi 1(qL),F;
;; 5)i+x-
*) zZiga q"
mylogger_notice "neither ipchains nor iptables" T_oL/x_;
;; R!2E`^{Wl
esac B1 xlWdm
} U\6Ee-1#_
+z+u=)I
restartservice() 34t[]v|LD
{ >Slu?{l'
local service O[R
if [ -z "$1" ] ; then [ip}f4K
mylogger_notice "no port given to see which service to be restart" |qtZb}"|
return Ns.{$'ll
fi ZC9S 0Z
qKNHhXi
case "$1" in FIpJ>E"n
80) }PzHtA,V
service="httpd" DhT8Kh{
;; #z9@x}p5g
25) ]9~6lx3/
service="postfix" VX e7b
;; P*kC>lvSv
110) )`}4rD^b
service="courier-pop3d" td |O#R
;; w s7LDY&(
21) YH{FTVOt{C
service="muddleftpd" .%_=(C< E
;; 4?l:.\fB:
53) K b
z|h,<
service="named" y-o54e$4Cq
;; FyA0"
3306) }?[a>.]u
service="mysqld" 90!67Ap`x
;; ?xtP\~
esac V)cL=4G
if [ ! -z "$service" ] ; then k4YW;6<C+
/etc/init.d/$service restart 1>/dev/null 2>/dev/null qfyuq]
if [ $? = 0 ] ; then B q7Qbj
mylogger_notice "$service restarted" ! k8j8v&
else d U#} Tk
mylogger_notice "$service restart failed" -h{|u{ t
fi n<Z1i)
fi fk(h*L|sI
} VZr AZV^c
&#<>fT_
docheckport() w>6 cc#>q
{ 2Z*^)ZQB
mylogger_info "do check port $1" 6>F]Z)]}
local port last_client count client total_count N3?hu}
7/6%92T/B
if [ -z "$1" ] ; then JI|MR #_u
mylogger_notice "docheckport() port not given" 2q%vd =T
return ZG Qz@H5
fi vXeI)vFK
_#T bO fu
port=$1 ^_JByB D
[PL]!\NJ
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` qBqh>Wo
if [ $? != 0 ] ; then yPVK>em5
mylogger_notice "netstat call failed" a_o99l P
return K1
m'20U
fi ? 7R&=B1g
#echo $clientlist
D:Fi/JY~
# reset new_block */A ~lR|
new_block=0 , nz3S5~
count=0 Kp%:\s,lO
total_count=0 NLF
6O9
last_client="" fkJElO-F
for client in $clientlist [ .c'22R6
do n$y@a? al
#echo "client is $client" }<g- 0&GLm
if [ -z "$last_client" ] ; then @]X5g8h
count=$((count+1)) b]@@x;v$@
total_count=$((total_count+1)) b]Z >P{ j
last_client=$client p
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else >PoVK{&y
if [ "$client" = "$last_client" ] ; then R zN9pAe
count=$((count+1)) fm&pxQjg
total_count=$((total_count+1)) Z$: iq
else *1CZRfWI
mylogger_debug "$last_client $count connections" R>dd#`r"
if [ $count -ge $max_active_conn ] ; then ^=7XA894
mylogger_notice "client $last_client connection $count >= $max_active_conn" N Ah^2X
blockclient $last_client $port 22r$Ri_>
fi _ 68{
{.
count=1 (I\qTf
N4
total_count=$((total_count+1)) d{
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last_client=$client DBk]2W|i
fi `F4gal^ ^
fi #D|n6[Y'.t
done .l +yK-BZ
# check the last client C] >?YR4
if [ ! -z "$client" ] ; then %)p? &_
count=$((count+1))
-mY,nMDb
total_count=$((total_count+1)) aYws{Vii
mylogger_debug "$client $count connections" Ji7<UJ30x
if [ $count -ge $max_active_conn ] ; then QI*< MF,1
mylogger_notice "client $client connection $count >= $max_active_conn" Sgq?r-Q.
blockclient $client $port i:\|G^h
fi +wxDK A_
fi #8@o%%F d
mylogger_info "total connections on port $port: $total_count" a<CACWsN.T
B\Uocn
if [ $new_block = 1 ] ; then V2LvE.Kj
restartservice $port YuFR*W;$
fi MZ"|Jn
} tZan1C%p>
Hp5.jor(k
docheckall() {.o@XP,.
{ z4{ :X Da
# reset wakeup_time ug ^es B
wakeup_time=$wakeup_time_max '^%kTNn
for port in $portlist /_</m?&.U&
do tR(nD UHV5
docheckport $port r$W%d[pB
if [ $new_block = 1 ] ; then % jn)=;\
# set wakeup_time shorter cause we found some abuse client v"-K-AQ jB
wakeup_time=$wakeup_time_min P7\?WN$p
fi \IZY\WU}2
done _
o.j({S
} ;b!qt-;.<
#p2`9o
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then GQ2/3 kt
firewall="ipchains" H{hzw&dZ<P
fi _$i)bJ
E
Y A=f
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if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then 8p]9A,Uq&
firewall="iptables" oI- ,6G}
fi sO{TGk]*
qHn X)
if [ -z "$firewall" ] ; then #mkf2Z=t-
echo "Error: This machine does not have ipchains or iptables firewall support" Q89fXi0Ivb
exit 1 sE&1ZJ]7
fi - 5JN`
)]kxLf#
mylogger_info "firewall.sh v$myver ValueOf.com starting" ,B'fOJ.2
mylogger_info "Firewall is: $firewall" |}b~YHTs
mylogger_info "Port protected: $portlist" aa" 3
Io
mylogger_info "Max connection per ip: $max_active_conn" pQ> |d H+.
mylogger_info "Min time to check: $wakeup_time_min""s" U7Oa
13Qz
mylogger_info "Max time to check: $wakeup_time_max""s" fbD,\ rjT
mylogger_info "Timeout circle: $rule_timeout""s" 4AMe>s
mylogger_info "Output is logged to: $log_facility" S=\cF,Zs
x#gZC 1$Y
# if new ip blocked at this check run? hfw+n
<
new_block=0 t<o7 S:a"
# if new ip blocked at this timeout run? CK1A$$gnz
ever_block=0 HLOr Dlj7
# reset wakeup_time "$ pbK:
wakeup_time=$wakeup_time_max 4}s'xMT!
S`$%C=a.
lasttime=`date +%s` 2vh }:A_
@<`V q
while [ 1 ] N`?|~g3
do NGJst_
curtime=`date +%s` eL~3 CAV{
timediff=$((curtime-lasttime)) -+Ot' ^
#echo "timediff: $timediff" 8&M<?oe
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then eh>
|m> JY
lasttime=$curtime {Wi*B (
ever_block=0 ptrwZ8'
dotimeout ^RO<r}B u
fi `hdff0
docheckall /_
})7I52
mylogger_info "sleep for $wakeup_time""s"
H(gY =
sleep $wakeup_time oyr b.lu /
done BGx wPJd
K1^7v}P
xT]t3'y|-
g'b|[ q
1. 说明 (' 7$K
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， w%s];E E
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。 dW%t ph
该程序可以同时保护多个端口 1Acs0` 3
LWm1j :0
2. 安装 2|=hF9
tar zxf firewall-1.0b.tar.gz B}[f
]8jrM
cd firewall-1.0b \
a,}1FS
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh >
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cM3B5Lp
3. 配置
`YC7+`q
主要配置项目如下： @fYVlHT%E
# 最小检查周期，缺省为120秒 Y
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wakeup_time_min=120 2 H}y1bkW
h? p_jI
# 最大检查周期，缺省为300秒 l=
p_
wakeup_time_max=600 E`I(x&_
\OtreYi
# 重设防火墙状态的时间，缺省为3600秒 ,c |
MB
rule_timeout=3600 J)Y`G4l2@
y ;Cs#eo
# 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) Y 4 HN1
# 一般的网络攻击都是针对80和25，又以80居多 RW+u5Y
portlist="80 25" $uDgBZA\
myR{ }G
# 每个ip可占用的最大活动（Established）连接数 'k[qx}
max_active_conn=8 lbda/Zx
_
\X ,a5Un
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 k\ .9iI'6
# 如果用的是ipchains，可以忽略此项 Rtz~:v%
iptables_chain_name="RH-Lokkit-0-50-INPUT" < ,0D|O ,Y
o& FOp'
# 日志输出目标 HvG %##
log_facility="local0"
P d~=:4
1*u]v {JJ(
**** 关于检查周期 **** qIQ=OY=6
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
I
U"
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。 ) 1 T2u
'Gl~P><e
**** ipchains vs iptables **** \L(cFjLIl
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 ,~naKd.ZY
/etc/sysconfig/iptables都没有检测到，则报错退出。 8xO
H_ $?b
**** 日志输出 ****
9 y*] {IY
程序的输出信息记录在系统日志中，目标是local0。如果没有特殊配置，可以在/var/log/messages中看到。建议在/etc/syslog.conf =|z:wlOs
中加入一条： 71R,R,
local0.* /var/log/firewall.log ][S q^5`
然后重新启动syslog nUP, Yd
/etc/init.d/syslog restart _J!^iJ
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 dR]-R/1|
>NBc-DX^
4. 运行 />S^`KSTM
/usr/prima/sbin/firewall.sh & CK7([>2
rpR yB9
范例输出： 5U~K Yy^v
*** firewall.sh v1.0b ValueOf.com*** ?z9!=A%<V~
Firewall is: ipchains RhE~Rw bx
Port protected: 80 25 `HRL .uX
Max connection per ip: 8 rQimQ| +
Min time to check: 120s 2xLtJR4L
Max time to check: 300s U9:)qvMXe
Timeout circle: 3600s ki'$P.v{$w
Output is logged to: local0 l)[|wPf
(I}owr5:
察看/var/log/firewall.log，可以看到： <t"T'\3
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 OS,!`8cw
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@V?L: J
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 $yASWz
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 S/`#6
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 4{u Q}ea
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 C(XV
YND3
05LkLB
5. 停止 K<J,n!zc
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 YcobK#c
# ps auxww|grep firewall.sh WoZU} T-
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh RK!9(^Ja
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh kg^0%-F
第一行即firewall.sh的进程，用kill命令： |0i{z(B
# kill 27932 7
XxZF43
[1] Terminated /usr/prima/sbin/firewall.sh -iR2UE@M
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
