diff --git a/heartbeat/portblock b/heartbeat/portblock index 608556612..362545828 100755 --- a/heartbeat/portblock +++ b/heartbeat/portblock @@ -1,548 +1,548 @@ #!/bin/sh # # portblock: iptables temporary portblocking control # # Author: Sun Jiang Dong (initial version) # Philipp Reisner (per-IP filtering) # # License: GNU General Public License (GPL) # # Copyright: (C) 2005 International Business Machines # # OCF parameters are as below: # OCF_RESKEY_protocol # OCF_RESKEY_portno # OCF_RESKEY_action # OCF_RESKEY_ip # OCF_RESKEY_tickle_dir # OCF_RESKEY_sync_script ####################################################################### # Initialization: : ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat} . ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs # Defaults OCF_RESKEY_ip_default="0.0.0.0/0" OCF_RESKEY_reset_local_on_unblock_stop_default="false" : ${OCF_RESKEY_ip=${OCF_RESKEY_ip_default}} : ${OCF_RESKEY_reset_local_on_unblock_stop=${OCF_RESKEY_reset_local_on_unblock_stop_default}} ####################################################################### CMD=`basename $0` TICKLETCP=$HA_BIN/tickle_tcp usage() { cat <&2 usage: $CMD {start|stop|status|monitor|meta-data|validate-all} $CMD is used to temporarily block ports using iptables. It can be used to turn off a port before bringing up an IP address, and enable it after a service is started. To do that for samba, the following resource line can be used: $CMD::tcp::137,138::block \\ 10.10.10.20 \\ nmbd smbd \\ $CMD::tcp::137,138::unblock - This will do the follwing things: + This will do the following things: - DROP all incoming packets for TCP ports 137 and 138 - Bring up the IP alias 10.10.10.20 - start the nmbd and smbd services - Re-enable TCP ports 137 and 138 (enable normal firewall rules on those ports) This prevents clients from getting ICMP port unreachable if they try to reconnect to the service after the alias is enabled but before nmbd and smbd are running. These packets will cause some clients to give up attempting to reconnect to the server. NOTE: iptables is linux-specific... An additional feature in the portblock RA is the tickle ACK function enabled by specifying the tickle_dir parameter. The tickle ACK triggers the clients to faster reconnect their TCP connections to the fail-overed server. Please note that this feature is often used for the floating IP fail- over scenario where the long-lived TCP connections need to be tickled. It doesn't support the cluster alias IP scenario. When using the tickle ACK function, in addition to the normal usage of portblock RA, the parameter tickle_dir must be specified in the action=unblock instance of the portblock resources. For example, you may stack resources like below: portblock action=block services portblock action=unblock tickle_dir=/tickle/state/dir If you want to tickle all the TCP connections which connected to _one_ floating IP but different ports, no matter how many portblock resources you have defined, you should enable tickles for _one_ portblock resource(action=unblock) only. The tickle_dir is a location which stores the established TCP connections. It can be a shared directory(which is cluster-visible to all nodes) or a local directory. If you use the shared directory, you needn't do any other things. If you use the local directory, you must also specify the sync_script paramater. We recommend you to use csync2 as the sync_script. For example, if you use the local directory /tmp/tickle as tickle_dir, you could setup the csync2 as the csync2 documentation says and configure your /etc/csync2/csync2.cfg like: group ticklegroup { host node1; host node2; key /etc/csync2/ticklegroup.key; include /etc/csync2/csync2.cfg; include /tmp/tickle; auto younger; } Then specify the parameter sync_script as "csync2 -xv". END } meta_data() { cat < 1.0 Resource script for portblock. It is used to temporarily block ports using iptables. In addition, it may allow for faster TCP reconnects for clients on failover. Use that if there are long lived TCP connections to an HA service. This feature is enabled by setting the tickle_dir parameter and only in concert with action set to unblock. Note that the tickle ACK function is new as of version 3.0.2 and hasn't yet seen widespread use. Block and unblocks access to TCP and UDP ports The protocol used to be blocked/unblocked. protocol The port number used to be blocked/unblocked. portno The action (block/unblock) to be done on the protocol::portno. action (try to) reset server TCP sessions when unblock stops If for some reason the long lived server side TCP sessions won't be cleaned up by a reconfiguration/flush/stop of whatever services this portblock protects, they would linger in the connection table, even after the IP is gone and services have been switched over to an other node. An example would be the default NFS kernel server. These "known" connections may seriously confuse and delay a later switchback. Enabling this option will cause this agent to try to get rid of these connections by injecting a temporary iptables rule to TCP-reset outgoing packets from the blocked ports, and additionally tickle them locally, just before it starts to DROP incoming packets on "unblock stop". The IP address used to be blocked/unblocked. ip The shared or local directory (_must_ be absolute path) which stores the established TCP connections. Tickle directory If the tickle_dir is a local directory, then the TCP connection state file has to be replicated to other nodes in the cluster. It can be csync2 (default), some wrapper of rsync, or whatever. It takes the file name as a single argument. For csync2, set it to "csync2 -xv". Connection state file synchronization script END } # # Because this is the normal usage, we consider "block" # resources to be pseudo-resources -- that is, their status can't # be reliably determined through external means. # This is because we expect an "unblock" resource to come along # and disable us -- but we're still in some sense active... # #active_grep_pat {udp|tcp} portno,portno active_grep_pat() { w="[ ][ ]*" any="0\\.0\\.0\\.0/0" echo "^DROP${w}${1}${w}--${w}${any}${w}${3}${w}multiport${w}dports${w}${2}\>" } #chain_isactive {udp|tcp} portno,portno ip chain_isactive() { PAT=`active_grep_pat "$1" "$2" "$3"` $IPTABLES -n -L INPUT | grep "$PAT" >/dev/null } save_tcp_connections() { [ -z "$OCF_RESKEY_tickle_dir" ] && return statefile=$OCF_RESKEY_tickle_dir/$OCF_RESKEY_ip if [ -z "$OCF_RESKEY_sync_script" ]; then netstat -tn |awk -F '[:[:space:]]+' ' $8 == "ESTABLISHED" && $4 == "'$OCF_RESKEY_ip'" \ {printf "%s:%s\t%s:%s\n", $4,$5, $6,$7}' | dd of="$statefile".new conv=fsync && mv "$statefile".new "$statefile" else netstat -tn |awk -F '[:[:space:]]+' ' $8 == "ESTABLISHED" && $4 == "'$OCF_RESKEY_ip'" \ {printf "%s:%s\t%s:%s\n", $4,$5, $6,$7}' \ > $statefile $OCF_RESKEY_sync_script $statefile > /dev/null 2>&1 & fi } tickle_remote() { [ -z "$OCF_RESKEY_tickle_dir" ] && return echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle f=$OCF_RESKEY_tickle_dir/$OCF_RESKEY_ip [ -r $f ] || return $TICKLETCP -n 3 < $f } tickle_local() { [ -z "$OCF_RESKEY_tickle_dir" ] && return f=$OCF_RESKEY_tickle_dir/$OCF_RESKEY_ip [ -r $f ] || return # swap "local" and "remote" address, # so we tickle ourselves. # We set up a REJECT with tcp-reset before we do so, so we get rid of # the no longer wanted potentially long lived "ESTABLISHED" connection # entries on the IP we are going to delet in a sec. These would get in # the way if we switch-over and then switch-back in quick succession. local i awk '{ print $2, $1; }' $f | $TICKLETCP netstat -tn | grep -Fw $OCF_RESKEY_ip || return for i in 0.1 0.5 1 2 4 ; do sleep $i awk '{ print $2, $1; }' $f | $TICKLETCP netstat -tn | grep -Fw $OCF_RESKEY_ip || break done } SayActive() { echo "$CMD DROP rule for INPUT chain [$*] is running (OK)" } SayConsideredActive() { echo "$CMD DROP rule for INPUT chain [$*] considered to be running (OK)" } SayInactive() { echo "$CMD DROP rule for INPUT chain [$*] is inactive" } #IptablesStatus {udp|tcp} portno,portno ip {block|unblock} IptablesStatus() { local rc rc=$OCF_ERR_GENERIC activewords="$CMD $1 $2 is running (OK)" if chain_isactive "$1" "$2" "$3"; then case $4 in block) SayActive $* rc=$OCF_SUCCESS ;; *) SayInactive $* rc=$OCF_NOT_RUNNING ;; esac else case $4 in block) if ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" status; then SayConsideredActive $* rc=$OCF_SUCCESS else SayInactive $* rc=$OCF_NOT_RUNNING fi ;; *) if ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" status; then SayActive $* #This is only run on real monitor events. save_tcp_connections rc=$OCF_SUCCESS else SayInactive $* rc=$OCF_NOT_RUNNING fi ;; esac fi return $rc } #IptablesBLOCK {udp|tcp} portno,portno ip IptablesBLOCK() { local rc=0 local try_reset=false if [ "$1/$4/$__OCF_ACTION" = tcp/unblock/stop ] && ocf_is_true $reset_local_on_unblock_stop then try_reset=true fi if chain_isactive "$1" "$2" "$3" then : OK -- chain already active else if $try_reset ; then $IPTABLES -I OUTPUT -p "$1" -s "$3" -m multiport --sports "$2" -j REJECT --reject-with tcp-reset tickle_local fi $IPTABLES -I INPUT -p "$1" -d "$3" -m multiport --dports "$2" -j DROP rc=$? if $try_reset ; then $IPTABLES -D OUTPUT -p "$1" -s "$3" -m multiport --sports "$2" -j REJECT --reject-with tcp-reset fi fi return $rc } #IptablesUNBLOCK {udp|tcp} portno,portno ip IptablesUNBLOCK() { if chain_isactive "$1" "$2" "$3" then $IPTABLES -D INPUT -p "$1" -d "$3" -m multiport --dports "$2" -j DROP else : Chain Not active fi return $? } #IptablesStart {udp|tcp} portno,portno ip {block|unblock} IptablesStart() { ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" start case $4 in block) IptablesBLOCK "$@";; unblock) IptablesUNBLOCK "$@" rc=$? tickle_remote #ignore run_tickle_tcp exit code! return $rc ;; *) usage; return 1; esac return $? } #IptablesStop {udp|tcp} portno,portno ip {block|unblock} IptablesStop() { ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" stop case $4 in block) IptablesUNBLOCK "$@";; unblock) save_tcp_connections IptablesBLOCK "$@" ;; *) usage; return 1;; esac return $? } # # Check if the port is valid, this function code is not decent, but works # CheckPort() { # Examples of valid port: "1080", "1", "0080" # Examples of invalid port: "1080bad", "0", "0000", "" echo $1 |egrep -qx '[0-9]+(:[0-9]+)?(,[0-9]+(:[0-9]+)?)*' } IptablesValidateAll() { check_binary $IPTABLES case $protocol in tcp|udp) ;; *) ocf_log err "Invalid protocol $protocol!" exit $OCF_ERR_CONFIGURED ;; esac if CheckPort "$portno"; then : else ocf_log err "Invalid port number $portno!" exit $OCF_ERR_CONFIGURED fi if [ -n "$OCF_RESKEY_tickle_dir" ]; then if [ x"$action" != x"unblock" ]; then ocf_log err "Tickles are only useful with action=unblock!" exit $OCF_ERR_CONFIGURED fi if [ ! -d "$OCF_RESKEY_tickle_dir" ]; then ocf_log err "The tickle dir doesn't exist!" exit $OCF_ERR_INSTALLED fi fi case $action in block|unblock) ;; *) ocf_log err "Invalid action $action!" exit $OCF_ERR_CONFIGURED ;; esac if ocf_is_true $reset_local_on_unblock_stop; then if [ $action != unblock ] ; then ocf_log err "reset_local_on_unblock_stop is only relevant with action=unblock" exit $OCF_ERR_CONFIGURED fi if [ -z $OCF_RESKEY_tickle_dir ] ; then ocf_log warn "reset_local_on_unblock_stop works best with tickle_dir enabled as well" fi fi return $OCF_SUCCESS } if ( [ $# -ne 1 ] ) then usage exit $OCF_ERR_ARGS fi case $1 in meta-data) meta_data exit $OCF_SUCCESS ;; usage) usage exit $OCF_SUCCESS ;; *) ;; esac if [ -z "$OCF_RESKEY_protocol" ]; then ocf_log err "Please set OCF_RESKEY_protocol" exit $OCF_ERR_CONFIGURED fi if [ -z "$OCF_RESKEY_portno" ]; then ocf_log err "Please set OCF_RESKEY_portno" exit $OCF_ERR_CONFIGURED fi if [ -z "$OCF_RESKEY_action" ]; then ocf_log err "Please set OCF_RESKEY_action" exit $OCF_ERR_CONFIGURED fi protocol=$OCF_RESKEY_protocol portno=$OCF_RESKEY_portno action=$OCF_RESKEY_action ip=$OCF_RESKEY_ip reset_local_on_unblock_stop=$OCF_RESKEY_reset_local_on_unblock_stop case $1 in start) IptablesStart $protocol $portno $ip $action ;; stop) IptablesStop $protocol $portno $ip $action ;; status|monitor) IptablesStatus $protocol $portno $ip $action ;; validate-all) IptablesValidateAll ;; *) usage exit $OCF_ERR_UNIMPLEMENTED ;; esac exit $?