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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 xY@<< 2'-o'z< #!/bin/sh LB/1To # this program is used to check tcp/ip connections LPS]TG\ # and block those ip with excessive connections H:4?sR3 !~-@p?kW/ # my version K
Oit7+Q myver="1.0RC1" '"]QAj?N d6zfP1lQ # wake up every 120s if last check found abuse client OYj~"-3y) wakeup_time_min=120 0
/fA>%& +OfHa\Nz # wake up every 300s if last check found no abuse client cb`ik)=K% wakeup_time_max=300 FSHC\8siS 2}kJN8\F # rule timeout 3600s ]Nb~-)t%B rule_timeout=3600
:\IZ- a4x(lx& # check port list fB`7f
$[ portlist="80" Ag_I' 57`9{.HB # max established connection per ip -b'a-? max_active_conn=8 d/l>~%bR K%(DRkj) # iptables chain name <gjA(xT5 iptables_chain_name="RH-Lokkit-0-50-INPUT" 2_CJV IpKpj"eoLy # log facility lvk
r2Meu< log_facility="local0" &0JCZ/e "XWO#,Ue # Block policy 1D2Yued ipchains_block_policy="DENY" VTs
,Ln!,U iptables_block_policy="REJECT" \@F!h8e4 :{M1]0NH # myself S|/Za".Gr myself=`basename $0` NG\^>.8 ILMXWw mylogger_info() faPgp { /rZ`e'} logger -p $log_facility.info -t $myself $@ 2>/dev/null b";D*\=x } Jpr`E&%I6 o 12wp mylogger_debug() z P=3B%$ { %fB!XCW logger -p $log_facility.debug -t $myself $@ 2>/dev/null }e4#Mx } 7$|L%Sk M\)(_I)V= mylogger_notice() XS`=8FQ { {p)=#Jd`.P logger -p $log_facility.notice -t $myself $@ 2>/dev/null H3Sfz' } P=PVOt@
b *;X,yEK[ dotimeout() 6[SE*/E@L { @&
}~r mylogger_info "reset firewall when timeout arrives" 8
rA'd case "$firewall" in k!=
jO#)Rd ipchains) v5g]_v*F /etc/init.d/ipchains restart 1>/dev/null 2>/dev/null ZGbY if [ $? = 0 ] ; then L6IF0`M<,I mylogger_info "ipchains restarted" O[v(kH' else wh)Ujgd mylogger_notice "ipchains restart failed"
v+qHH8 fi oH]"F ;; ra>jVE0` iptables) #(f- cK /etc/init.d/iptables restart 1>/dev/null 2>/dev/null XWNDpL`j5 if [ $? = 0 ] ; then @l^BW*BCo mylogger_info "iptables restarted" `6BjNV else /%9CR'%*c mylogger_notice "iptables restart failed" ewD=(yr fi 'H.,S_v1x ;; >p,FAz> *) [S#QGB19 mylogger_notice "neither ipchains nor iptables" >wJt# ZB ;; |uRZT3bGyj esac &yt
noj1L( whdoG{/ } Lkl+f~m xK
W`m blockclient() N@>o:(08 { oM4Q_An if [ -z "$1" ] || [ -z "$2" ]; then E`aAPk_y mylogger_notice "blockclient() missing client or port to block" z0Bw+&
^]} return r"uOf;m fi 1y)|m63& local ip port ~Vf+@_G8` 6;8Jy ip=$1 _xVtB1@kLM port=$2 pf'-(W+ .tny"a& case "$firewall" in ?'L3B4 ipchains) 28N
v' mylogger_notice "blocking $1 to $2 via ipchains" 'Lb-+X, found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` 7Y>17=| if [ -z "$found" ] ; then QlmZ4fT[r cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" H]XY mylogger_debug "cmd: $cmd" O
DLRzk( `ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` :s}6a23 if [ $? != 0 ] ; then <+tSTc4>r mylogger_notice "$cmd call failed" DV return aU)NbESu fi ]&dU%9S new_block=1 z~S(OM@olJ ever_block=1 ~T{^7"q\ else BXCB/:0 mylogger_info "$ip already blocked to $port" fnwhkL#8 fi lD%Fk3 ;; "
aEk#W iptables) #%;QcDXRe mylogger_notice "blocking $1 to $2 via iptables" 2+2Gl7" s found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"`
(SEE(G35 if [ -z "$found" ] ; then cILI%W1 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" S[2uez` mylogger_debug "cmd: $cmd" !R;NV|.eI6 `iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` z^ai * if [ $? != 0 ] ; then $j+RUelFY mylogger_notice "$cmd call failed" Q|DVB return F1Jd-3ei fi (mNNTMe new_block=1 DFk0"+Ky ever_block=1 Qb.Ve7c else k
Y}r^NaQA mylogger_info "$ip already blocked to $port" T4M"s;::1 fi tFi'RRZ ;; pL&
Zcpx *) 7gk}f%,3P mylogger_notice "neither ipchains nor iptables" #[uDVCM ;; Fv<^\q esac 7xhBdi[ dQ } ]UMt M3 TsalF restartservice()
js$L<^7 { n&n WY+GEo local service \U?$r[P if [ -z "$1" ] ; then f i
_'Ny># mylogger_notice "no port given to see which service to be restart" Qms,kX return %$*WdK# fi P&=H<^yd na4^>:r~ case "$1" in "C/X#y
80) nn?h;KzB service="httpd" Wp
|qv ;; nkxv,_)ZT 25) (oxMBd+n1 service="postfix" y(fJ{k ;; t8?$q})RL 110) >3qfo2K0 service="courier-pop3d" {S$61ut ;; k
E},>+W+ 21) |\<L7|hb9 service="muddleftpd" Ef]<0Tm]: ;; wsEOcaie 53) :lBw0{fP service="named" HDYWDp ;; 1'YUK"i 3306) &hcD/*_Z service="mysqld" {WvYb, ;; {HtW`r1)Tt esac BIXbdo5F if [ ! -z "$service" ] ; then vyvb-oz;u /etc/init.d/$service restart 1>/dev/null 2>/dev/null Ke^9R-jP if [ $? = 0 ] ; then \OwCZ!`7i mylogger_notice "$service restarted" jct'B}@X( else *M-'R*Np mylogger_notice "$service restart failed" .aQ8I1~ fi +xS<^;
fi Gc_KS'K@$ } k'NP+N<M jdkqJ4&i docheckport() i_:#][nWX { K{9 mylogger_info "do check port $1" `{NbMc\
] local port last_client count client total_count C@g/{?\ 11%Zx3 if [ -z "$1" ] ; then I#'yy7J mylogger_notice "docheckport() port not given" *xN?5u% return Lb?0< fi xwj{4fzpk{ U,lO{J[T port=$1 bc;?O`I< e-nwR clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` qfRrX" if [ $? != 0 ] ; then q{+}0!o mylogger_notice "netstat call failed" X`fm5y return Zy|u5J fi GiKhdy #echo $clientlist m}f{o # reset new_block W
XG0Z new_block=0 )-h{0o count=0 [Fv_~F491 total_count=0 [ua[A;K last_client="" JSx[V<7m for client in $clientlist 1^ iLs do Qz"//=hC|H #echo "client is $client" GIfs]zVr` if [ -z "$last_client" ] ; then foB&H;A4oC count=$((count+1)) +{}p(9w@ total_count=$((total_count+1)) )6eFYt%c last_client=$client ?j)#\s2 else T5}5uk9 if [ "$client" = "$last_client" ] ; then Z_7TD) count=$((count+1)) 6/vMK<Fz9 total_count=$((total_count+1)) ad52a3deR else 6WoFf mylogger_debug "$last_client $count connections" *~w?@,} if [ $count -ge $max_active_conn ] ; then C4t~k mylogger_notice "client $last_client connection $count >= $max_active_conn" i8DYC=r blockclient $last_client $port ]7RK/Zu i fi jpOcug`f count=1 4VkJtu5 total_count=$((total_count+1)) NxB/U_j last_client=$client 23opaX5V= fi rP/W,!
7:K fi jO`L:D/C done RLGIST` # check the last client O<XNI(@ if [ ! -z "$client" ] ; then GB>T3l" count=$((count+1)) "L9pFz</ total_count=$((total_count+1)) rKl mylogger_debug "$client $count connections" NIC.c3 if [ $count -ge $max_active_conn ] ; then aDE}'d1qo mylogger_notice "client $client connection $count >= $max_active_conn" -or)NE
blockclient $client $port 3v)``
n@ fi >-(,BfZ fi T3-/+4$0v mylogger_info "total connections on port $port: $total_count" xI
~c~KC gNh4c{Al9 if [ $new_block = 1 ] ; then Nxm '*
-A restartservice $port hr
g'Z5n fi 0EC/l
OS } \K:?#07Wj4 IY|>'}UU# docheckall() B>
zQ[e@t { So#>x5dL # reset wakeup_time
L$[1+* wakeup_time=$wakeup_time_max RNX>I,2sh for port in $portlist Ia>~ph#]{` do r#^uY:T% docheckport $port 1(
]{tF if [ $new_block = 1 ] ; then `(@{t:L # set wakeup_time shorter cause we found some abuse client .+-7 'ux wakeup_time=$wakeup_time_min zB+zw\ncN fi aOW$H:b done Q_|Lv& } e41r!od =M34
HPG if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then ]U5/!e firewall="ipchains" c nV2}U/\ fi ~@K!>j FJ O-p if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then CNyV6jb firewall="iptables" \v([,tiW% fi bH_zWk Bfr$&?j# if [ -z "$firewall" ] ; then Np R&`] echo "Error: This machine does not have ipchains or iptables firewall support" s;YuB#Z exit 1 3[iHe+U( fi IHNl`\Le 9Zpd=m8dU mylogger_info "firewall.sh v$myver ValueOf.com starting" SFa~j)9'n mylogger_info "Firewall is: $firewall" %jmL
#IN) mylogger_info "Port protected: $portlist" Y'2 |GJc2 mylogger_info "Max connection per ip: $max_active_conn" ?ZT+4U00U mylogger_info "Min time to check: $wakeup_time_min""s" eEMU,zCl mylogger_info "Max time to check: $wakeup_time_max""s" O
O`-{HKt mylogger_info "Timeout circle: $rule_timeout""s" W&8)yog. mylogger_info "Output is logged to: $log_facility" UqaV9 *S=zJyAO # if new ip blocked at this check run? q3-V_~5^/z new_block=0 DZ~qk+,I # if new ip blocked at this timeout run? t^-yK;`?q: ever_block=0 +Q6}kbDI # reset wakeup_time h#!u"'JW wakeup_time=$wakeup_time_max 9>na3ISh #^~[\8v> lasttime=`date +%s` TwZASn]o WYklS<B[ while [ 1 ] A$]&j5nh| do
KixS)sG curtime=`date +%s` B5Y
3GWhrx timediff=$((curtime-lasttime)) E
u^?e #echo "timediff: $timediff" &58+-jzW if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then [j]3='2}G lasttime=$curtime ,>rr|O ever_block=0 _z$lg]q dotimeout }bxW@(bs fi c[~LI<>ic docheckall "
tUS>c/ mylogger_info "sleep for $wakeup_time""s" q{?ku!cL sleep $wakeup_time K9YD)351t done }
:@s
5g{F- ^K#PcPF-j +v`?j+6z 1. 说明 U?}>A5H firewall.sh是一个shell脚本程序,每隔一段时间检查tcp连接的统计信息,如果来自某个ip对某个端口的活动连接超过规定的最大数量, =&J7
'nDP 则自动将该IP对该端口的访问屏蔽,并重新启动相应的服务。再每隔一段时间,会重设防火墙到初始状态。 .1[[Y} 该程序可以同时保护多个端口 RvQl{aL i8\&J. 2. 安装 LyRU2A tar zxf firewall-1.0b.tar.gz eco
i4f cd firewall-1.0b -xc*R%k install -m 700 firewall.sh /usr/prima/sbin/firewall.sh {q[l4_ 8KQ]3Z9p 3. 配置 'n9<z)/,! 主要配置项目如下: kXmnLxhS/ # 最小检查周期,缺省为120秒 t_-1sWeA! wakeup_time_min=120 \Qh{uk[ q\P"AlpC! # 最大检查周期,缺省为300秒 nty^De% wakeup_time_max=600 XF`,mV4 '8Q:}{ # 重设防火墙状态的时间,缺省为3600秒 |6%B2I&c rule_timeout=3600 FY^[?lj (QPfrR=J4 # 保护的端口列表,缺省为80和25,支持的其他端口包括21(ftp), 110(pop3), 53(named), 3306(mysql) 7>Af"1$g # 一般的网络攻击都是针对80和25,又以80居多 TV~<1vj portlist="80 25" (8(7:aE$ H8V${&!ho # 每个ip可占用的最大活动(Established)连接数 lzQmD/
i* max_active_conn=8 1keH1[ u7_IO # iptables防火墙规则链名称,必须和/etc/sysconfig/iptables中一致 ^^u{W|'CaH # 如果用的是ipchains,可以忽略此项 eY)JuJ? iptables_chain_name="RH-Lokkit-0-50-INPUT" ewNzRH,b bZ-"R 6a$ # 日志输出目标 ?R7>xrp5 log_facility="local0" ZfPWH'P )575JY `6K **** 关于检查周期 **** IXm}WTgF! 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 V
&K:~[M 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。 z|w@eQ", xWwQm'I2} **** ipchains vs iptables **** Z/#&c 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 \`H"4r[?( /etc/sysconfig/iptables都没有检测到,则报错退出。 _Eus<c e)pQh&uD **** 日志输出 **** o"^+i#H! 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 }ze,6T*z 中加入一条: 5pJ)OX local0.* /var/log/firewall.log k<aKT?Ek> 然后重新启动syslog -8j<`(M'5 /etc/init.d/syslog restart _0~WT 这样,可以将firewall.sh输出的日志单独记到文件/var/log/firewall.log里。 aR3R,6ec s:_M+_7_ 4. 运行 _/@VV5Mq /usr/prima/sbin/firewall.sh & ~hubh!d= :lF[k`S T 范例输出: >C6wm^bl *** firewall.sh v1.0b ValueOf.com*** [@SLt$9" Firewall is: ipchains q+A^JjzT Port protected: 80 25 L@ ,-V Max connection per ip: 8 d>ltL`xn Min time to check: 120s JsNqijVC Max time to check: 300s +&LzLF.bK Timeout circle: 3600s cR;zNS Output is logged to: local0 h/h`?vWu h@{U>U7 察看/var/log/firewall.log,可以看到: *gu4% Oct 16 14:08:55 server firewall.sh: do check port 80 // 检查80端口 UQGOCP_ Oct 16 14:08:55 server firewall.sh: 192.168.0.60 2 connections // 有两个来自192.168.0.60的连接 J(BtGGU' Oct 16 14:08:55 server firewall.sh: total connections on port 80: 2 // 80端口总共2个连接 b9M.p*! Oct 16 14:08:55 server firewall.sh: do check port 25 // 检查25端口 [Z2:3*5r. Oct 16 14:08:55 server firewall.sh: total connections on port 25: 0 // 25端口没有连接 m'Jk!eo Oct 16 14:08:55 server firewall.sh: sleep for 300s // 等待300秒 +y!B`'J _
pu G?p 5. 停止 `aY{$>$S 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 I(6k.PQ # ps auxww|grep firewall.sh d*%-r2K root 27932 0.0 0.5 2312 1060 pts/2 S 12:38 0:00 /bin/sh /usr/prima/sbin/firewall.sh ;Qpp[V` root 27967 0.0 0.3 1732 592 pts/2 S 12:39 0:00 grep firewall.sh 5pNbO[ 第一行即firewall.sh的进程,用kill命令: 5oz[Njq4 # kill 27932 !"u) `I2 [1] Terminated /usr/prima/sbin/firewall.sh WNkAI9B 即将其终止
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Posted: 2008-01-26 02:12 |
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