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linux自动屏蔽IP工具
另存为 firewall.sh 给执行的权限 *Cb(4h- ^2??]R&Q
#!/bin/sh O.$<Bf9
# this program is used to check tcp/ip connections !J71[4t # and block those ip with excessive connections Sc0ZT/Lm F@I_sGCcb # my version q@!:<Ra,){ myver="1.0RC1" ZE\t{s0 ,H%\+yn{ # wake up every 120s if last check found abuse client /d=$,q1 wakeup_time_min=120 E+2y-B)E r"Bf@va # wake up every 300s if last check found no abuse client *@ o3{0[Z wakeup_time_max=300 WIGb7}egR <7&b|f$CL # rule timeout 3600s UB1/FM4~ rule_timeout=3600 m,KY_1%M oD 8-I^ # check port list wTW"1M portlist="80" E.6\(^g aj,ZM,Ad # max established connection per ip MQ+ek4 max_active_conn=8 }Q=Zqlvz 96.Wfx # iptables chain name
4[r
a iptables_chain_name="RH-Lokkit-0-50-INPUT" JU@$( }cT}G;L'- # log facility R3PhKdQ" log_facility="local0" >H1d9y+Z }:mI6zsNj # Block policy J$Q-1fjj ipchains_block_policy="DENY" ah92<'ix iptables_block_policy="REJECT" F"=MU8 Wg%-m%7O # myself %)D7Dr myself=`basename $0` f3>/6C -AT@M1K7% mylogger_info() =/;_7|ssd { B`F82_O logger -p $log_facility.info -t $myself $@ 2>/dev/null D'h2 DP! } ="DgrH 3(:mRb} mylogger_debug() C\^K6,m5 { /v{[Z
&z logger -p $log_facility.debug -t $myself $@ 2>/dev/null o zYI/b^ } o,yvi [q&J"dt mylogger_notice() pJz8e&wyLM { L\ %_<2 logger -p $log_facility.notice -t $myself $@ 2>/dev/null `<zb } i!3K G|V !r*;R\!n2 dotimeout() Q*.FUV&; { Q
/c
WV mylogger_info "reset firewall when timeout arrives" _6!/}Fm case "$firewall" in (NdgF+'= ipchains) <6C9R> /etc/init.d/ipchains restart 1>/dev/null 2>/dev/null ?+5{HFx if [ $? = 0 ] ; then rcx;3Vne mylogger_info "ipchains restarted" P|4E1O else ^Nw]'e3 mylogger_notice "ipchains restart failed" N[bN"'U/1 fi rR@n>
Xx ;; *\KMkx iptables) w3qf7{b /etc/init.d/iptables restart 1>/dev/null 2>/dev/null I#t9aR+& if [ $? = 0 ] ; then 'c0'P%[5A mylogger_info "iptables restarted" ^70 .g?(f[ else .k`*$1?73x mylogger_notice "iptables restart failed" `B\KS*Gya# fi 9c{%m4 ;; V-;nj,.mY *) (4ci=*3= mylogger_notice "neither ipchains nor iptables" a^c,=X3 ;; AKKU-5
B9c esac cm@ oun e4qk>Cw } h0GdFWN wYQ1Z blockclient() 9`
CiE { KPjqw{gR_R if [ -z "$1" ] || [ -z "$2" ]; then e0N=2i?I#z mylogger_notice "blockclient() missing client or port to block" #~URLN return M-Z6TL fi y:|.m@
j1 local ip port x|v[Dxf] H]i+o6 ip=$1 s/G5wRl< port=$2 h`EH~ W0:z 0^!,[oh6* case "$firewall" in Ag>>B9 ipchains) 1Fvv/Tj mylogger_notice "blocking $1 to $2 via ipchains" Nx4DC found=`ipchains -nL | egrep "^$ipchains_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+\->[[:space:]]+$port"` &FJU%tFA if [ -z "$found" ] ; then ZaRr2Z:! cmd="ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null" t|#NMRz mylogger_debug "cmd: $cmd" qN1e{T8u `ipchains -I input 1 -p tcp -s $ip -d 0/0 $port -j $ipchains_block_policy 1>/dev/null 2>/dev/null` _yxe2[TD if [ $? != 0 ] ; then XgiI6-B~ mylogger_notice "$cmd call failed" Q_dXRBv=n return
KF:]4`$ fi Pa+AF new_block=1 f
$.\o ever_block=1 ~b>nCP8q else
'{j\0 mylogger_info "$ip already blocked to $port" ]s*[Lib fi uFrJ:l+ ;; :\1rQT iptables) uGP[l`f|FQ mylogger_notice "blocking $1 to $2 via iptables" Qe @A5# found=`iptables -nL | egrep "^$iptables_block_policy.*[[:space:]]+$ip[[:space:]]+.*[[:space:]]+dpt:$port[[:space:]]+"` Ersr\ZB if [ -z "$found" ] ; then fw:7Q7
qo 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" ?b*/ddIs mylogger_debug "cmd: $cmd" r21?c|IP `iptables -I $iptables_chain_name 1 -p tcp -m tcp -s $ip --dport $port -j $iptables_block_policy 1>/dev/null 2>/dev/null` fXF=F,!t if [ $? != 0 ] ; then =9DhO7I' mylogger_notice "$cmd call failed" ?;:9
W return DJ
1XNpm fi 4hsPbUx9 new_block=1 NS
Mjr_ ever_block=1 OQytgXED else g33<qYxP mylogger_info "$ip already blocked to $port" bK_0NrXP fi =1
{H
Sf ;; $I)Tk`= *) gD,YQ%aq mylogger_notice "neither ipchains nor iptables" m6bWmGnGC ;; hV3,^#9o esac S\!
a"0$ } 8Ehy9< L?3VyBE restartservice() W\I$`gyC/ { T8,k77 local service D:YN_J"kV if [ -z "$1" ] ; then -vv
mylogger_notice "no port given to see which service to be restart" \&eY)^vw return ' +)6#/* fi kdK*MUB S_(&UeTC case "$1" in Qv&T E3 80) q*HAIw[<y service="httpd" S2koXg( ;; 6obQ9L c 25)
LFEp service="postfix" E0sbU<11 ;; +G5'kYzJ 110) RtW4n:c service="courier-pop3d" 2.StG(Y! ;; Q;XXgX#l 21) #[no~&E service="muddleftpd" )v${&H ;; ,DE(5iDS 53) yQu vW$ service="named" hWe}'L- ;; i0ILb/LS 3306) i{<8
hLO service="mysqld" dj?
G.- ;; YH6snC$u esac G
i$ if [ ! -z "$service" ] ; then s ;48v /etc/init.d/$service restart 1>/dev/null 2>/dev/null E2>im>p if [ $? = 0 ] ; then ILNE 4n mylogger_notice "$service restarted" -Bl/4p else UP\8w#~ mylogger_notice "$service restart failed" w+Ad$4Pf" fi )$MS
0[? fi #o"tMh!f } w(aUEWYL wh9L(0 docheckport() j6`6+W=S( { ZQ@3P7T mylogger_info "do check port $1" #g,H("Qy({ local port last_client count client total_count pMOD\J:l, "_t4F4z if [ -z "$1" ] ; then cvxIp#FbW mylogger_notice "docheckport() port not given" `$H7KI G return TV?
^c?{5 fi VIetcs ,bxz]S1W port=$1 VZ;@S3TS %j%%Rn clientlist=`netstat -an --tcp| grep ESTABLISHED | awk "{ if ( index(\\$4,\":$port\") ) print \\$5}" | awk -F ':' '{print $1}'|sort` V!mWn|lf if [ $? != 0 ] ; then OO$|9`a mylogger_notice "netstat call failed" 0xv\D0 return I
I&< fi gEE9/\>%- #echo $clientlist B.El a # reset new_block AYt*'Zeg!s new_block=0 CK=ARh#|
count=0 0
"4J"q]& total_count=0 Il|GCj*N last_client="" Rb?~ Rs\ for client in $clientlist @#A!w;bz do g2A"1w<-AH #echo "client is $client" jBS'g{y-! if [ -z "$last_client" ] ; then (p^S~Ax count=$((count+1)) u9BjgK(M total_count=$((total_count+1)) s~=g*99H last_client=$client S3QaYq"v else rJX\6{V!_ if [ "$client" = "$last_client" ] ; then TKd6MZhT count=$((count+1)) *]>])ms) total_count=$((total_count+1)) |ebvx
?\ else 5 1"8Py mylogger_debug "$last_client $count connections" % oR>Uo if [ $count -ge $max_active_conn ] ; then u"\=^F mylogger_notice "client $last_client connection $count >= $max_active_conn" #sS9vv7i blockclient $last_client $port K0LbZMn,/ fi y>)MAzz~\ count=1 4?
v,wq total_count=$((total_count+1)) V+.Q0$~F5 last_client=$client &lU Ny
L fi Et.j1M|g fi J+lGh9G done ZzT&$J7]`{ # check the last client )Y~xIj> if [ ! -z "$client" ] ; then -IbbPuRq count=$((count+1)) O<>#>[ total_count=$((total_count+1)) v[smQO mylogger_debug "$client $count connections" _!%M
% if [ $count -ge $max_active_conn ] ; then qv$!\ T mylogger_notice "client $client connection $count >= $max_active_conn" A*R n<{U blockclient $client $port 7pP+5&* fi #3.
\j"b fi h07eEg mylogger_info "total connections on port $port: $total_count" UP]1(S? o(zTNk5d if [ $new_block = 1 ] ; then .$P|^Zx, restartservice $port `\ R{5TU fi 0d";Hh: } _;7fraqX 0 7\02f docheckall() 1|]xo3j"' { -Uri|^t # reset wakeup_time hF.6}28U1 wakeup_time=$wakeup_time_max DFc [z"[ for port in $portlist HitAc8 do ewym1}o docheckport $port `.[ 8$ if [ $new_block = 1 ] ; then `R0Y+#$8h # set wakeup_time shorter cause we found some abuse client >D~w}z/fk wakeup_time=$wakeup_time_min gApz:K[l fi r@yD8 D \ done S/fW/W*/} } {>h97}P >(3'Tnu if [ -z "$firewall" ] && [ -f /etc/sysconfig/ipchains ] ; then lV)G@l[1 firewall="ipchains" ,Bf(r fi a,cC!
'?8Tx&}U8 if [ -z "$firewall" ] && [ -f /etc/sysconfig/iptables ] ; then >XnO&hW firewall="iptables" 8U=A{{0p fi B2(,~^39 LABNj{=D! if [ -z "$firewall" ] ; then ]u0Jd#@ echo "Error: This machine does not have ipchains or iptables firewall support" 1eD.:_t4 exit 1 @)b^^Fp fi r.<JDdj />F.Nsujy mylogger_info "firewall.sh v$myver ValueOf.com starting" T>F9Hs W mylogger_info "Firewall is: $firewall" D%gGRA mylogger_info "Port protected: $portlist" N5!&~~ mylogger_info "Max connection per ip: $max_active_conn" >)3VbO mylogger_info "Min time to check: $wakeup_time_min""s" |!}wF}iLc) mylogger_info "Max time to check: $wakeup_time_max""s" F~R7~ZE mylogger_info "Timeout circle: $rule_timeout""s" OD|1c6+X mylogger_info "Output is logged to: $log_facility"
w~LU\Ct
%Rarr # if new ip blocked at this check run? u5F}( +4r new_block=0 x5F@ad9 # if new ip blocked at this timeout run? aS/`A ever_block=0 L;yEz[#xaT # reset wakeup_time 0H+c4IW wakeup_time=$wakeup_time_max P7r4ePtLk{ ET+'Pj3 lasttime=`date +%s` %w:'!X>< L$hc, while [ 1 ] =fWdk\Wv do |_nC6; curtime=`date +%s` <
T4(H[9B timediff=$((curtime-lasttime)) yoU2AMH2D^ #echo "timediff: $timediff" @ef$b?wg if [ $timediff -ge $rule_timeout ] && [ $ever_block = 1 ] ; then b{pg!/N4 lasttime=$curtime jb
3.W ever_block=0 L|J~9FM dotimeout F[]& | |