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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 -"nYCF
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#!/bin/sh - 'V
T
# this program is used to check tcp/ip connections e.kt]l
# and block those ip with excessive connections He*L"VpWv
_k@l-Bj
# my version 5(|ud)v
myver="1.0RC1" ZT8j9zs
X5y h S
# wake up every 120s if last check found abuse client ;Dgp
!*v=
wakeup_time_min=120 Y'~&%|9+T
[aC9vEso!
# wake up every 300s if last check found no abuse client )K6{_~Kc\
wakeup_time_max=300 xr2:bu
LYF vzw>M
# rule timeout 3600s H}~^,B2;
rule_timeout=3600 *Wa u
7
]>,|v,i
=
# check port list 1mV0AE538
portlist="80" TExlGAHo+O
OY#_0p)i
# max established connection per ip pk4&-iu9
max_active_conn=8 Oe!&Jma*>
!;a <E
:
# iptables chain name eH8.O
iptables_chain_name="RH-Lokkit-0-50-INPUT" d!:So Z
Qa%SvA@R
# log facility A&'%ou
log_facility="local0" ZB% ~>
AF}"
# Block policy : \OvVS/
ipchains_block_policy="DENY" nSiNSLv
iptables_block_policy="REJECT" x TZ5q*Hqx
4C cb!?
# myself Iycx Rig
myself=`basename $0` Gp+XM
Se`N5hQ
mylogger_info() 8|GpfW3p 2
{ WRyL
pTr-
logger -p $log_facility.info -t $myself $@ 2>/dev/null `.g8JC\_m
} CK</2 w +
9(WC# -,
mylogger_debug() `qz5rPyZ
{ GcCs}
(eo
logger -p $log_facility.debug -t $myself $@ 2>/dev/null Nk4_!
}
!ei20@
5qEdN
mylogger_notice() {; DZ@2|
{ 2*YX m>
|1
logger -p $log_facility.notice -t $myself $@ 2>/dev/null jt--w"|-r
} x^2/jUc#B
@ F^L4 N':
dotimeout() Ue:T3jp 3%
{ eb@Lh!
mylogger_info "reset firewall when timeout arrives" re J?38(
case "$firewall" in x{V>(d'p
ipchains) [frD
L)
/etc/init.d/ipchains restart 1>/dev/null 2>/dev/null 86F+N _>Z
if [ $? = 0 ] ; then 7`@?3?
mylogger_info "ipchains restarted" E]?HCRa5R
else d}cJ5 !d
mylogger_notice "ipchains restart failed" K0=E4>z,`q
fi mm<iT59
;; 7h /Q;P5
iptables) g
'a?
/etc/init.d/iptables restart 1>/dev/null 2>/dev/null =w$"w zc
if [ $? = 0 ] ; then z2V 8NUn
mylogger_info "iptables restarted" k]9> V@C
else 0a 6z "K}
mylogger_notice "iptables restart failed" Z*)Y:tk)b
fi 6x ,=SW@4
;; ~<[5uZIo
*) @/NZ>.
mylogger_notice "neither ipchains nor iptables" [HiTR !o*
;; ||ZufFO
esac 0+y~RTAVB
<O)X89dFM
} JgKZ;GM:W
eEGcio}_I9
blockclient() 3=|2Gs?ut
{ aa%&&
if [ -z "$1" ] || [ -z "$2" ]; then [d~bZS|(T(
mylogger_notice "blockclient() missing client or port to block" z "$d5XR
return "mK i$FV
fi =/QU$[7X(
local ip port (s@tU>4U
{%~4RZA
ip=$1 #Q7x :,f
port=$2 4J
51i *`
^C)T M@+
case "$firewall" in ME@6.*
ipchains) :htq%gPex9
mylogger_notice "blocking $1 to $2 via ipchains" J1Ki2I=
found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` eQax ZMU
if [ -z "$found" ] ; then >"<k8wn
cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" 1LId_ vJtJ
mylogger_debug "cmd: $cmd" Ao, ! z
`ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` fw|+7 O
if [ $? != 0 ] ; then T'b/]&0Tio
mylogger_notice "$cmd call failed" %::d eV7
return 6+B{4OY
fi =i^<a7M~
new_block=1 KA-/k@1&
ever_block=1 N>pmhsk N?
else c6Aut`dK
mylogger_info "$ip already blocked to $port" ^L-w(r62<
fi :IR9=nhS]
;; y
B4H3Q )
iptables) p ba8=Z
mylogger_notice "blocking $1 to $2 via iptables" Vl 19Md
found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` 4OOn, 09
if [ -z "$found" ] ; then JYg% ~tW'
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" %`?;V;{=
mylogger_debug "cmd: $cmd" 9XoQO 9*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` phgexAq
if [ $? != 0 ] ; then W[>iJJwz
mylogger_notice "$cmd call failed"
4j@i%
return x9)aBB
fi BU9J_rCIv
new_block=1 R>d@tr
ever_block=1 )W`SC mr]
else HUJ|-)"dw
mylogger_info "$ip already blocked to $port" OpK. Lsd0y
fi /BMtcCPG!
;; @GG(7r\/B
*) <8rgtu!VU
mylogger_notice "neither ipchains nor iptables" OQ(D5GR:4
;; LZM,QQ
esac zb5N,!%r
} ' :\fl.b
WHUT/:?f
restartservice() dh^+l;!L
{ [dj5 $l|
local service PMgQxM*h
if [ -z "$1" ] ; then M%$ D T
mylogger_notice "no port given to see which service to be restart" I?a8h`WS+
return co5y"yj_
fi F#(.v7
Za
_i3i HR?
case "$1" in |l|_dn
80) V43nws "4
service="httpd" tTotPPZf}
;; 'nRp}s1^[
25) n6b3E *
service="postfix" cYGRy,'gH
;; M
h`CP
110) dQ:
?<
zZ
service="courier-pop3d" Kb}MF9?:e
;; 6Wj@r!u
21) n0_B(997*
service="muddleftpd" ~&1KrUu&
;; ezp<@'0ZT
53) hM~eJv
service="named" U,e'ZRU6
;; #wr2imG6
3306) U\Ct/U&A?
service="mysqld" j "5Pe
;; 1e/L\Y=m
esac !g8* r"[UJ
if [ ! -z "$service" ] ; then [*Q-nZ/L
/etc/init.d/$service restart 1>/dev/null 2>/dev/null UxyY<H~Wx
if [ $? = 0 ] ; then Y;} 2'"
mylogger_notice "$service restarted" @r F/]UJ
else e#. \^
mylogger_notice "$service restart failed" gI)u}JX
fi lX"b N=E?!
fi <
kz[:n:
} &&WDo(r3
Km,*)X.-5
docheckport() B| tzF0;c
{ H'EY)s Hi
mylogger_info "do check port $1" atyu/+U'}
local port last_client count client total_count \^&
tjj^O%SV<
if [ -z "$1" ] ; then
(= 9 wo
mylogger_notice "docheckport() port not given" aVwH
return gz;&u)
fi y yP'Z~0
Ra[ >P _
port=$1 cD2+hp|9
n_P 3\Y|
clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` 'z5h3J
if [ $? != 0 ] ; then \tx% WC
mylogger_notice "netstat call failed" v0#*X5
C1'
return QL97WK\$
fi +{$QAjW(/
#echo $clientlist rQJ"&CapT
# reset new_block |CIC$ 2u
new_block=0 y\'P3i hK
count=0 M4KWN'
total_count=0 iY ~rne"l
last_client="" 5wT>N46UX
for client in $clientlist J[@u m:
do BAV> o |-K
#echo "client is $client" .VM 3D0aV
if [ -z "$last_client" ] ; then UXH" si:
count=$((count+1)) 8uch i
total_count=$((total_count+1)) L9FHgl?
last_client=$client "NzD1k6.L
else }T.?c9l X
if [ "$client" = "$last_client" ] ; then ) R?;M
count=$((count+1)) {2
%aCC V
total_count=$((total_count+1)) p'f%%#I
else B$vr'U
mylogger_debug "$last_client $count connections" o>?*X( +le
if [ $count -ge $max_active_conn ] ; then 0Fw6Dq<8-!
mylogger_notice "client $last_client connection $count >= $max_active_conn" &aG*k*
blockclient $last_client $port zhblLBpeE\
fi 2c(aO[%h9
count=1 A8DFm{})c
total_count=$((total_count+1)) ,v9f~qh
last_client=$client R Oc`BH=
fi j_cs;G: "
fi "T S
done e3(/qMl
# check the last client JkQ\)^5v
if [ ! -z "$client" ] ; then ~1kXUWq3
count=$((count+1)) 5x8+xw3Eh
total_count=$((total_count+1)) 9z>z3,ftN
mylogger_debug "$client $count connections" Uf\nFB? ^
if [ $count -ge $max_active_conn ] ; then ^tH#YlV4>9
mylogger_notice "client $client connection $count >= $max_active_conn" MJ{%4S{K,p
blockclient $client $port Ts$@s^S]
fi ut2 ~rRiK
fi Vz=a uM1xZ
mylogger_info "total connections on port $port: $total_count" >vbY<HGt
D
w<k3zaW
if [ $new_block = 1 ] ; then \G |%Z w|
restartservice $port .dMVoG5
fi a->3`c
} l B91An
M~Ttb29{
docheckall() Ro(Zmk\t
{ U_G gCI)
# reset wakeup_time KhbYr$
wakeup_time=$wakeup_time_max ~]C%/gEh
for port in $portlist V5F%_,No
do v
*-0M
docheckport $port RoGwK*j0+
if [ $new_block = 1 ] ; then q@hzo>[
# set wakeup_time shorter cause we found some abuse client 2 {Vcb
wakeup_time=$wakeup_time_min }Z-Z| G)#
fi $Fkaa<9;P
done %V9ZyQg%*
} 7Z ;?b0W
:r #)z4d5
if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then 0& >H^
firewall="ipchains" CI U1R;
fi 8K(Z0
Q\ /uKQ
if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then X$%
4$
firewall="iptables" .MQ^(
fi ui q^|5Z
'r1LSht'
if [ -z "$firewall" ] ; then 8r"+bhGx~
echo "Error: This machine does not have ipchains or iptables firewall support" tCxF~L@
exit 1 Twn4 lG4~
fi )-* 5v
D
KL$bqgc(p3
mylogger_info "firewall.sh v$myver ValueOf.com starting" 1I@8A>2^OX
mylogger_info "Firewall is: $firewall" Hbv6_ H
mylogger_info "Port protected: $portlist" T91moRv
mylogger_info "Max connection per ip: $max_active_conn" u:0aM}9A
mylogger_info "Min time to check: $wakeup_time_min""s" Oo kh<ES>
mylogger_info "Max time to check: $wakeup_time_max""s" "ju6XdZ
o
mylogger_info "Timeout circle: $rule_timeout""s" ()&~@ 1U
mylogger_info "Output is logged to: $log_facility" CLvX!O(~
pTIf@n6I
# if new ip blocked at this check run? p<=$
&*
new_block=0 L(&&26Y
# if new ip blocked at this timeout run? ca+5 =+X7
ever_block=0 F:x [
# reset wakeup_time z5ij(RE]
wakeup_time=$wakeup_time_max 2UG sYQn
TB0
5?F
lasttime=`date +%s` mI 74x3 [
pz"0J_xDM
while [ 1 ] p/+a=Yo
do *6q5S4 r
curtime=`date +%s` /?SLdW
timediff=$((curtime-lasttime)) 5\z `-)
#echo "timediff: $timediff" wI(M^8F_Mf
if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then *}P~P$q%
lasttime=$curtime g +z1
ever_block=0 <)1qt
9
dotimeout 82l~G;.n3
fi HTG%t/ S
docheckall wm Tb97o
mylogger_info "sleep for $wakeup_time""s" =?!wX Og_
sleep $wakeup_time \ Yx/(e
done `nu''B
H
\-g)T}g,I
<7~'; K
n rjE.+ v
1. 说明 GW fL
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， vam;4vyu
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。
$ ` ""
该程序可以同时保护多个端口 *WuID2cOI
Z.L c>7o
2. 安装 :=Nz }mUV
tar zxf firewall-1.0b.tar.gz o 2F)%T DY
cd firewall-1.0b {z{bY\
install -m 700 firewall.sh /usr/prima/sbin/firewall.sh .6Pw|xu`Pw
, 5h)x"s
3. 配置 DW[N|-L
主要配置项目如下： rbWP78
# 最小检查周期，缺省为120秒 *_d7 E
wakeup_time_min=120
$| @
(
1ukT A@Rj&
# 最大检查周期，缺省为300秒 s*. hl.k.
wakeup_time_max=600 5j?3a1l0
C&(N
I
# 重设防火墙状态的时间，缺省为3600秒 ``hf=
`We
rule_timeout=3600 D9H?:pmv?
" y}--
# 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) p OIJH =#
# 一般的网络攻击都是针对80和25，又以80居多 k
5'Vy8q
portlist="80 25" vg32y /l]S
u 7> ],<
# 每个ip可占用的最大活动（Established）连接数 Q' {M L4
max_active_conn=8 Y i.N& &o
*nkoPVpC
# iptables防火墙规则链名称，必须和/etc/sysconfig/iptables中一致 iv J@=pd)B
# 如果用的是ipchains，可以忽略此项 v
dc\R?
iptables_chain_name="RH-Lokkit-0-50-INPUT" %]}
-cAo@}v
# 日志输出目标 ;U+3w ~
log_facility="local0" 2K/4 Rf0;
<L8' ! q}
**** 关于检查周期 **** 8;RUf~q?
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 W}@c|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。 3u+T~g0^
V^bwXr4f
**** ipchains vs iptables **** .ypL=~Rp
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 Ot _]3:`J~
/etc/sysconfig/iptables都没有检测到，则报错退出。 9 8I Ju
R'as0 u\
**** 日志输出 **** [}E='m}u9+
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 61C7.EZZ;
中加入一条： 2*;~S4 4
local0.* /var/log/firewall.log 3nO]Ge"w'n
然后重新启动syslog >*
f-Wde
/etc/init.d/syslog restart Qb-M6ihcc
这样，可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 l*Gvf_UH
-A^ _{4X
4. 运行 MzdV 2.
/usr/prima/sbin/firewall.sh & WUn]F~Lt
c < :-T
范例输出： X:"i4i[}{9
*** firewall.sh v1.0b ValueOf.com*** ?Jm^<
Firewall is: ipchains cKca;SNql1
Port protected: 80 25 #4 <SAgq
Max connection per ip: 8 {#vgtgBB
Min time to check: 120s NZ:,ph
Max time to check: 300s %v
M-mbX
Timeout circle: 3600s EH J
.T~X
Output is logged to: local0 #jvt US \
Mq 15 6TL
察看/var/log/firewall.log，可以看到： .5_ 2zat0H
Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 gh]cXuph
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 lfow1WRF
Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 Z"xvh81P
Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 ,]F,Uu_H7
Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 76{ G'}B
Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 X 'Xx" M
W:2( .?
5. 停止 9s
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 D%pF;XY
# ps auxww|grep firewall.sh l ukB8
root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh x=P\qjSa
root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh cKI9#t_
第一行即firewall.sh的进程，用kill命令： zR:L! S
# kill 27932 <)H9V-5aZ
[1] Terminated /usr/prima/sbin/firewall.sh -uG +BraI
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
