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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 U&C\5N] eqD%Qdx #!/bin/sh uh\I' # this program is used to check tcp/ip connections ;dRTr * # and block those ip with excessive connections ^TVica $V]D7kDph* # my version @NlnZfMu myver="1.0RC1" yb*
SD! @,CCwiF'q # wake up every 120s if last check found abuse client ?q7VB wakeup_time_min=120 +NxEx/{ 6?+bi\6 # wake up every 300s if last check found no abuse client ^.mQ~F wakeup_time_max=300 R5
X<8(4p sw' 20I # rule timeout 3600s {b<p~3%+Hc rule_timeout=3600 N1\u~%AT" >9esZA^'; # check port list
tU!"CX portlist="80" q_g'4VZv Fr,>| # max established connection per ip ='pssdB max_active_conn=8 TA`*]*O( W+H27qsv # iptables chain name ]QtdT8~ iptables_chain_name="RH-Lokkit-0-50-INPUT" >
9JzYI^ ^
^} # log facility 59$mfW
o> log_facility="local0" Y%^&aac Z W7l/{a
@ # Block policy _:c8YJEG{ ipchains_block_policy="DENY" M_T$\z;, iptables_block_policy="REJECT" 2(5wFc VMad ]bEf # myself ^KF myself=`basename $0` w{F8]N>0<
iq5h[ mylogger_info() }-V .upl { BtBy.bR logger -p $log_facility.info -t $myself $@ 2>/dev/null ~b3xn T } @s/;y VVq &I:X[=;g mylogger_debug() nl*{@R.q @ { KT{<iz_ logger -p $log_facility.debug -t $myself $@ 2>/dev/null Tx/ } p
tv v^[tK2&v mylogger_notice() $w[@L7'( { [53@
'@26 logger -p $log_facility.notice -t $myself $@ 2>/dev/null p|(910OEQ } NZ{kjAd3c lH:TE=|4 dotimeout() >^|\wy { Eqp?cKrji mylogger_info "reset firewall when timeout arrives" Jc`LUJ
T case "$firewall" in kVkV~ ipchains) ukS@8/eJ /etc/init.d/ipchains restart 1>/dev/null 2>/dev/null .
g(yTA if [ $? = 0 ] ; then T-fW[][&$ mylogger_info "ipchains restarted" ;lW0p8 else 8@6:UR.) mylogger_notice "ipchains restart failed" hrU.QF8 fi EZ1H0fm ;; hP3I_I[qF} iptables) A[htG\A` 0 /etc/init.d/iptables restart 1>/dev/null 2>/dev/null egx(N
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if [ $? = 0 ] ; then B
wtD!de$ mylogger_info "iptables restarted" IH}?CZ@{? else N=tyaS(YJ mylogger_notice "iptables restart failed" JaG<.ki fi ofcoNLX5c ;; 1ReO.Dd`R *) [K&O]s<Y mylogger_notice "neither ipchains nor iptables" cU%#oEMf< ;; (yc$W9 esac ,dzbI{@6 ~u,g5 } >/5D/}4 *% Vd2jW/ blockclient() *=@Z\]"? { #mx;t3ja7 if [ -z "$1" ] || [ -z "$2" ]; then 1MfRFv mylogger_notice "blockclient() missing client or port to block" rIW`(IG_ return Q}\,7l fi dL6sb;7R local ip port qL A t~sW]<qjp ip=$1 lSXhHy port=$2 ou,W|<% aH'^`]'_= case "$firewall" in ~NU~jmT2 ipchains) >[ lj8n mylogger_notice "blocking $1 to $2 via ipchains" I`Rxijz found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` <pK;D if [ -z "$found" ] ; then IK~ur\3 cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" =k3QymA mylogger_debug "cmd: $cmd" -?LSw `ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` r8^1JJ~\ if [ $? != 0 ] ; then {oBVb{< mylogger_notice "$cmd call failed" F^A1'J return eUF PzioW fi A{&Etu(K new_block=1 -bo0!@MK ever_block=1 &W.tjqmw else -pg7>vO q mylogger_info "$ip already blocked to $port" MKoN^(7 fi 'y'>0'et ;; qDcl;{L iptables) W%vh7>. mylogger_notice "blocking $1 to $2 via iptables" I&1Mh4yu found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` v[F_r if [ -z "$found" ] ; then 6@Eip[e cmd="iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null" EWH'x$z_q mylogger_debug "cmd: $cmd" K;[V`)
d' `iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` #n~/~*:i92 if [ $? != 0 ] ; then li/O&@g` mylogger_notice "$cmd call failed" BMFpkK9| return BT`/OD@ fi iW)FjDTP new_block=1 ijyj}gpWha ever_block=1 w9.r`_- else FA4bv9:hi mylogger_info "$ip already blocked to $port" (VBoZP=W fi `$MO.K{ ;; E\RQm}Z09 *) O- r"G mylogger_notice "neither ipchains nor iptables" }>)"!p;t_ ;; nM}X1^PiK" esac UN,@K9 } !>t|vgW "d.qmM
restartservice() 9LCV"xgX { 7b'XQ/rs local service (A( d]l if [ -z "$1" ] ; then Pf@8C{I mylogger_notice "no port given to see which service to be restart" 'SOp!h$ return jQsucs5$h fi w
l5!f| z
@<`] case "$1" in X}Fc0Oo 80) v*]|1q%/ service="httpd" qZA?M=NT?
;; hQl3F6-ud 25) 6,s@>8n service="postfix" H={fY:% ;; ~?[@KK 110) QLIm+)T service="courier-pop3d" wIi(p5* ;; QD /| zi 21) {b]WLBy service="muddleftpd" OL=IUg" ;; G^ n|9)CVW 53) #M{}Grg service="named" Ct
#hl8b: ;; %{o5}TqD 3306) PjRKYa_U service="mysqld" -41L^Di\ ;; mN~;MR; esac SM0= if [ ! -z "$service" ] ; then i-tX5Md| /etc/init.d/$service restart 1>/dev/null 2>/dev/null :Wb+&|dU if [ $? = 0 ] ; then c3K(mM: mylogger_notice "$service restarted" ?WUu@Z else ]+fL6"OD/2 mylogger_notice "$service restart failed" ~EX/IIa{ fi MPM_/dn- fi OP``g/x) } (QqKttL: ?4gYUEM# docheckport() >f}rM20Vm { FDpNM\SR1l mylogger_info "do check port $1" h9SS
o0]F local port last_client count client total_count KA%tVBl >/evL
/ if [ -z "$1" ] ; then +F4xCz7f mylogger_notice "docheckport() port not given" e$Md?Pq return 2Ni2Gkf@
fi j3A+:KDn3n a Se.]_ port=$1 8fZ\})t JWH}0+1* clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` Z#^2F8,] if [ $? != 0 ] ; then <>2QDI6_ mylogger_notice "netstat call failed"
[o>/2 return o$Hc5W([Z fi 9;JUc0% #echo $clientlist M!mTNIj8~ # reset new_block X9zTz2 Fy new_block=0 ?Cmb3pX^\ count=0 7.akp total_count=0 /`2VJw
last_client="" vT3LhN+1 for client in $clientlist b@5&<V;r2 do p72
+:I #echo "client is $client" bCA3w%,k
M if [ -z "$last_client" ] ; then lL%7lO count=$((count+1)) m0/J3 total_count=$((total_count+1)) h'T\gF E% last_client=$client _VR4|)1g else eYR/kZ%< if [ "$client" = "$last_client" ] ; then _%<7!|" count=$((count+1)) yf_<o total_count=$((total_count+1)) Ia>qVM0 else I~4`NV0 mylogger_debug "$last_client $count connections" {jlm]< | |