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Deimplement original 'netnotsyn' handling
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2766 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep
parent
314b4ffd36
commit
2b6a9bb843
@ -8,6 +8,8 @@ Changes in 2.5.7
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4) Rename 'plain' to 'ipv4'
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5) Deimplement NEWNOTSYN
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Changes in 2.5.6
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1) Finish install/fallback cleanup.
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@ -243,8 +243,6 @@ finish_chain_section() # $1 = canonical chain $2 = state list
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[ -n "$FASTACCEPT" ] || run_iptables -A $1 -m state --state $2 -j ACCEPT
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if list_search RELATED $(separate_list $2) ; then
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[ -z "$NEWNOTSYN" ] && run_iptables -A $1 -m state --state NEW -p tcp ! --syn -j newnotsyn
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if is_policy_chain $1 ; then
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if eval test -n \"\$${1}_synparams\" ; then
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if [ $SECTION = DONE ]; then
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@ -295,7 +293,7 @@ finish_section() # $1 = Section(s)
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# variable exists_${1} and set its value to Yes to indicate that the chain now
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# exists.
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#
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createchain() # $1 = chain name, $2 = If "yes", create newnotsyn rule
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createchain() # $1 = chain name, $2 = If "yes", do section-end processing
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{
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local c=$(chain_base $1)
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@ -310,9 +308,6 @@ createchain() # $1 = chain name, $2 = If "yes", create newnotsyn rule
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finish_chain_section $1 ESTABLISHED
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;;
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esac
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[ -z "$NEWNOTSYN" ] && \
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run_iptables -A $1 -m state --state NEW -p tcp ! --syn -j newnotsyn
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fi
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eval exists_${c}=Yes
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@ -1167,7 +1162,7 @@ validate_interfaces_file() {
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case $option in
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-)
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;;
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dhcp|tcpflags|newnotsyn|arp_filter|routefilter|logmartians|sourceroute|blacklist|proxyarp|maclist|nosmurfs|upnp|-)
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dhcp|tcpflags|arp_filter|routefilter|logmartians|sourceroute|blacklist|proxyarp|maclist|nosmurfs|upnp|-)
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;;
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norfc1918)
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addr=$(ip -f inet addr show $interface 2> /dev/null | grep inet | head -n1)
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@ -1483,7 +1478,7 @@ validate_hosts_file() {
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for option in $(separate_list $options) ; do
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case $option in
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maclist|norfc1918|blacklist|tcpflags|nosmurfs|newnotsyn|-)
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maclist|norfc1918|blacklist|tcpflags|nosmurfs|-)
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;;
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ipsec)
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[ -n "$POLICY_MATCH" ] || \
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@ -4546,7 +4541,7 @@ map_old_action() # $1 = Potential Old Action
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#
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process_actions1() {
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ACTIONS="dropBcast allowBcast dropNonSyn dropNotSyn rejNotSyn dropInvalid allowInvalid allowinUPnP allowoutUPnP forwardUPnP"
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ACTIONS="dropBcast allowBcast dropNotSyn rejNotSyn dropInvalid allowInvalid allowinUPnP allowoutUPnP forwardUPnP"
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USEDACTIONS=
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@ -4787,15 +4782,6 @@ process_actions3() {
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fi
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fi
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;;
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dropNonSyn)
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error_message "WARNING: \"dropNonSyn\" has been replaced by \"dropNotSyn\""
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if [ "$COMMAND" != check ]; then
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[ -n "$xlevel" ] && \
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log_rule_limit ${xlevel%\!} $xchain dropNonSyn DROP "" "$xtag" -A -p tcp ! --syn
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run_iptables -A $xchain -p tcp ! --syn -j DROP
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fi
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;;
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dropNotSyn)
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if [ "$COMMAND" != check ]; then
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[ -n "$xlevel" ] && \
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@ -7408,30 +7394,6 @@ initialize_netfilter () {
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[ -f $accounting_file ] && setup_accounting $accounting_file
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if [ -z "$NEWNOTSYN" ]; then
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createchain newnotsyn no
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for host in $(find_hosts_by_option newnotsyn); do
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ipsec=${host%^*}
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host=${host#*^}
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[ -n "$POLICY_MATCH" ] && policy="-m policy --pol $ipsec --dir in" || policy=
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interface=${host%%:*}
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network=${host#*:}
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run_iptables -A newnotsyn -i $interface $(match_source_hosts $network) $policy -p tcp --tcp-flags ACK ACK -j ACCEPT
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run_iptables -A newnotsyn -i $interface $(match_source_hosts $network) $policy -p tcp --tcp-flags RST RST -j ACCEPT
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run_iptables -A newnotsyn -i $interface $(match_source_hosts $network) $policy -p tcp --tcp-flags FIN FIN -j ACCEPT
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run_iptables -A newnotsyn -i $interface $(match_source_hosts $network) $policy -j RETURN
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done
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run_user_exit newnotsyn
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if [ -n "$LOGNEWNOTSYN" ]; then
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log_rule $LOGNEWNOTSYN newnotsyn DROP
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fi
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run_iptables -A newnotsyn -j DROP
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fi
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createchain reject no
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createchain dynamic no
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createchain smurfs no
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@ -8857,8 +8819,6 @@ do_initialize() {
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LOG_MARTIANS=
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DETECT_DNAT_IPADDRS=
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MUTEX_TIMEOUT=
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NEWNOTSYN=
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LOGNEWNOTSYN=
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FORWARDPING=
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MACLIST_DISPOSITION=
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MACLIST_LOG_LEVEL=
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@ -9017,8 +8977,6 @@ do_initialize() {
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[ -n "$FORWARDPING" ] && \
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startup_error "FORWARDPING=Yes is no longer supported"
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NEWNOTSYN=$(added_param_value_yes NEWNOTSYN $NEWNOTSYN)
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maclist_target=reject
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if [ -n "$MACLIST_DISPOSITION" ] ; then
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@ -115,16 +115,6 @@
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# shorewall.conf. After logging, the
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# packets are dropped.
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#
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# newnotsyn - TCP packets that don't have the SYN
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# flag set and which are not part of an
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# established connection will be accepted
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# from these hosts, even if
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# NEWNOTSYN=No has been specified in
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# /etc/shorewall/shorewall.conf.
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#
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# This option has no effect if
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# NEWNOTSYN=Yes.
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#
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# ipsec - The zone is accessed via a
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# kernel 2.6 ipsec SA. Note that if the
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# zone named in the ZONE column is
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@ -113,27 +113,6 @@
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# sub-networking as described at:
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# http://www.tldp.org/HOWTO/mini/Proxy-ARP-Subnet
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#
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# newnotsyn - TCP packets that don't have the SYN
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# flag set and which are not part of an
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# established connection will be accepted
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# from this interface, even if
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# NEWNOTSYN=No has been specified in
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# /etc/shorewall/shorewall.conf. In other
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# words, packets coming in on this
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# interface are processed as if
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# NEWNOTSYN=Yes had been specified in
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# /etc/shorewall/shorewall.conf.
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#
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# This option has no effect if
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# NEWNOTSYN=Yes.
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#
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# It is the opinion of the author that
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# NEWNOTSYN=No creates more problems than
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# it solves and I recommend against using
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# that setting in shorewall.conf (hence
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# making the use of the 'newnotsyn'
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# interface option unnecessary).
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#
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# routeback - If specified, indicates that Shorewall
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# should include rules that allow
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# filtering traffic arriving on this
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@ -20,6 +20,11 @@ New Features in 2.5.7:
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"IPv4" and "IPV4" are synonyms for "ipv4". In addition, "IPSEC",
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"ipsec4" and "IPSEC4" are recognized synonyms for "ipsec".
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3) The NEWNOTSYN and LOGNEWNOTSYN options in shorewall.conf have been
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removed as have the 'newnotsyn' options in /etc/shorewall/interfaces
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and /etc/shorewall/hosts. See the Migration Considerations for
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instructions if you wish to block "new-not-syn" TCP packets.
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Migration Considerations:
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1) The "monitor" command has been eliminated.
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@ -200,6 +205,23 @@ Migration Considerations:
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scripts like WonderShaper should see no change provided that
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execute permission is placed on /etc/shorewall/tcstart.
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11) The NEWNOTSYN and LOGNEWNOTSYN options in shorewall.conf have been
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removed as have the 'newnotsyn' options in /etc/shorewall/interfaces
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and /etc/shorewall/hosts.
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TCP new-not-syn packets may be blocked using the 'dropNonSyn' or
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'rejNonSyn' built-in actions.
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Example: Reject all new-not-syn packets from the net and log them at
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the 'info' level.
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#ACTION SOURCE DEST PROTO
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SECTION NEW
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rejNonSyn:info net all tcp
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Note that the rule is added at the front of the NEW section of the
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rules file.
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New Features in Shorewall 2.5.*
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1) Error and warning messages are made easier to spot by using
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@ -165,23 +165,6 @@ LOGALLNEW=
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BLACKLIST_LOGLEVEL=
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#
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# LOGGING 'New not SYN' rejects
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#
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# This variable only has an effect when NEWNOTSYN=No (see below).
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#
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# When a TCP packet that does not have the SYN flag set and the ACK and RST
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# flags clear then unless the packet is part of an established connection,
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# it will be rejected by the firewall. If you want these rejects logged,
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# then set LOGNEWNOTSYN to the syslog log level at which you want them logged.
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#
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# See the comment at the top of this section for a description of log levels
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#
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# Example: LOGNEWNOTSYN=debug
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#
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LOGNEWNOTSYN=info
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#
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# MAC List Log Level
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#
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@ -558,52 +541,6 @@ DETECT_DNAT_IPADDRS=No
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MUTEX_TIMEOUT=60
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#
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# NEWNOTSYN
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#
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# TCP connections are established using the familiar three-way "handshake":
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#
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# CLIENT SERVER
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#
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# SYN-------------------->
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# <------------------SYN,ACK
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# ACK-------------------->
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#
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# The first packet in that exchange (packet with the SYN flag on and the ACK
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# and RST flags off) is referred to in Netfilter terminology as a "syn" packet.
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# A packet is said to be NEW if it is not part of or related to an already
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# established connection.
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#
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# The NEWNOTSYN option determines the handling of non-SYN packets (those with
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# SYN off or with ACK or RST on) that are not associated with an already
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# established connection.
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#
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# If NEWNOTSYN is set to "No" or "no", then non-SYN packets that are not
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# part of an already established connection will be dropped by the
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# firewall. The setting of LOGNEWNOTSYN above determines if these packets are
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# logged before they are dropped.
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#
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# If NEWNOTSYN is set to "Yes" or "yes" then such packets will not be
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# dropped but will pass through the normal rule/policy processing.
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#
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# Users with a High-availability setup with two firewall's and one acting
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# as a backup should set NEWNOTSYN=Yes. Users with asymmetric routing may
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# also need to select NEWNOTSYN=Yes.
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#
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# The behavior of NEWNOTSYN=Yes may also be enabled on a per-interface basis
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# using the 'newnotsyn' option in /etc/shorewall/interfaces and on a
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# network or host basis using the same option in /etc/shorewall/hosts.
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#
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# I find that NEWNOTSYN=No tends to result in lots of "stuck"
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# connections because any network timeout during TCP session tear down
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# results in retries being dropped (Netfilter has removed the
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# connection from the conntrack table but the end-points haven't
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# completed shutting down the connection). I therefore have chosen
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# NEWNOTSYN=Yes as the default value.
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#
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NEWNOTSYN=Yes
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#
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# FOR ADMINS THAT REPEATEDLY SHOOT THEMSELVES IN THE FOOT
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#
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@ -2,6 +2,7 @@
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# tcstart from tc4shorewall Version 0.5
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# (c) 2005 Arne Bernin <arne@ucbering.de>
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# Modified by Tom Eastep for integration into the Shorewall distribution
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# published under GPL Version 2
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created_tmp_dir=
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