topic Re: One-liner for Address Spoofing Troubleshooting in Firewall and Security Management

One-liner for Address Spoofing Troubleshooting

Danny — Sun, 19 Feb 2023 17:33:53 GMT

🏆 Code Hub Contribution of the Year 2019!
📌 Available as SmartConsole Extension.
👍 Endorsed by Check Point Support!

One-liner (Bash) to show a summary about each gateway interfaces' calculated topology and address spoofing setting.
In expert mode run:

echo;tput bold;if [[ `$CPDIR/bin/cpprod_util FwIsFirewallModule 2>/dev/null` != *'1'* ]];then echo ' Not a firewall gateway!';tput sgr0;echo;elif [[ `grep $(echo -n :[[:space:]]\(;grep $(hostname)$ /etc/hosts|cut -f1 -d' ') $FWDIR/state/local/FW1/local.set|wc -l` == "0" ]] && ([[ $INSTANCE_VSID == '0' ]] || [[ $INSTANCE_VSID == '' ]]);then echo ' Main IP of '$(hostname)' doesn`t match it`s management interface IP!';tput sgr0;echo;else echo -n ' Interface Topology ';tput sgr0;echo -n '> ';tput bold;tput setaf 1;if [[ -n "$vsname" ]] && [[ $vsname != *'unavail'* ]];then echo $vsname' (ID: '$INSTANCE_VSID')';else hostname;fi;tput sgr0;echo -n ' ';printf '%.s-' {1..80};echo;egrep -B1 $'ifindex|:ipaddr|\(\x22<[0-9]|objtype|has_addr_info|:monitor_only|:external' $FWDIR/state/local/FW1/local.set|sed -n "/$(if [[ -n "$vsname" ]] && [[ $vsname != *'unavail'* ]] && [[ $INSTANCE_VSID != '0' ]];then echo $vsname;else grep `hostname`$ /etc/hosts|cut -f1 -d' ';fi)*$/,\$ p"|tail -n +3|sed 's/[\x22\t()<>]//g'|sed 's/--//g'|sed '$!N;s/\n:ipaddr6/ IPv6/;P;D'|sed '/IPv6/!s/://g'|sed 's/interface_topology/\tCalculated Interface Topology/g'|sed '0,/ifindex 0/{/ifindex 0/d;}'|sed '/ifindex 0/q'|sed '/spoof\|scan/d'|sed 's/has_addr_info true/\tAddress Spoofing Protection: Enabled/g'|sed 's/has_addr_info false/\tAddress Spoofing Protection: Disabled/g'|sed -e '/Prot/{n;d}'|sed '$!N;s/\nmonitor_only true/ (Detect Mode)/;P;D'|sed '$!N;s/\nmonitor_only false/ (Prevent Mode)/;P;D'|sed '$!N;s/\nexternal false/ - Internal Interface/;P;D'|sed '$!N;s/\nexternal true/ - External Interface/;P;D'|sed '/objtype/q'|tac|sed '/ifindex 0/I,+2 d'|sed '/Address/,$!d'|tac|sed '/ifindex/d'|sed 's/,/ -/g'|sed '$!N;s/\nipaddr/ >/;P;D'|sed '/ - /s/^ /\t/'|egrep -C 9999 --color=auto $'>|IPv6|External|Disabled|Detect';echo;fi

The One-liner is IPv4 and IPv6 compatible, works on clustered and single gateway environments also within VSX, shows all interface types configured in your firewall object within SmartDashboad, colors specific words of the output for easier identification of important settings, adds additional information regarding Address Spoofing setting and mode as well as the topology type of each interface and is of course completely integrated within our ccc script.

Thanks to Tim Hall's preliminary work in this thread.
Thanks to Norbert Bohusch for IPv6 support and testing.
Thanks to Kaspars Zibarts, Bob Zimmerman, Jan Kleinhans for VSX support and testing.
Thanks to Anthony Joubaire for support and testing multiple installation targets.

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Fri, 22 Jun 2018 11:46:50 GMT

Hi Denny,

I built something once.
Depending on the interface, the corresponding networks from the IP spoofing area are displayed.

More see in this article:

Show Address Spoofing Networks via CLI

First experiment:

ifconfig -a | grep encap | awk '{print $1}' | grep -v lo | grep -v bond | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq'

Second experiment:

Final version:

Output:

eth0
   10.0.0.0, 10.255.255.255
   192.168.1.0, 192.168.1.255
eth2
   0.0.0.0, 9.255.255.255
   11.0.0.0, 126.255.255.255
   128.0.0.0, 192.168.41.255
   192.168.202.0, 223.255.255.255
   192.168.43.0, 192.168.200.255
   240.0.0.0, 255.255.255.254
eth3
   192.168.2.0, 192.168.2.255
eth5
   10.172.1.0, 10.172.1.255

Can be formatted even better with AWK,TR,SED.

Best Regards

Heiko

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Fri, 21 Jun 2019 09:18:49 GMT

With IP and netmask:

ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v bond | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;more $FWDIR/state/local/FW1/local.set | grep -A 8 %|grep ip| tr \a\d\r\: \ ;echo -n " mask " ;ifconfig % | sed -rn "2s/ .*:(.*)$/\1/p";echo " spoofing networks:";more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq |tr \<\>\:\" \ ;echo " "'

More see in this article:

https://community.checkpoint.com/docs/DOC-2990-show-address-spoofing-networks-via-cli

Output:

eth0                                                         < Interface
ip 10.1.1.251                                          < IP
ip 10.1.1.252

mask 255.255.255.0 < Netmask

spoofing networks:
10.0.0.0, 10.255.255.255 < spoofing networks
192.168.1.0, 192.168.1.255

eth2
ip 1.1.1.211
ip 1.1.1.212

mask 255.255.255.0

spoofing networks:
     0.0.0.0, 9.255.255.255
     11.0.0.0, 126.255.255.255
     128.0.0.0, 192.168.41.255
     192.168.220.0, 223.255.255.255
     192.168.4.0, 192.168.8.255
     240.0.0.0, 255.255.255.254

eth3
ip 192.168.2.131
ip 192.168.2.132

mask 255.255.255.0

spoofing networks:
192.168.2.0, 192.168.2.255

eth5
ip 10.172.1.102
ip 10.172.1.103

mask 255.255.255.0

spoofing networks:
10.172.1.0, 10.172.1.255

PS:

Here two IP addresses are visible, because it is a cluster with vip.

Re: One-liner for Address Spoofing Troubleshooting

PhoneBoy — Fri, 22 Jun 2018 18:41:21 GMT

Sweet!

Does that meet your requirements Danny Jung‌?

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Fri, 22 Jun 2018 21:18:16 GMT

Hi, Denny,

2500 points are a bit much 10 while also ok.
We all like to help.

I'm going to update the CLI command a little bit this weekend. Maybe there's more you can get out of it.

I think that's very helpful. I would also like to include the routes and separate the VIP and physical IP.

Regards

Heiko

Re: One-liner for Address Spoofing Troubleshooting

Danny — Mon, 25 Jun 2018 07:34:40 GMT

Your version contains an issue where an interface is still configured in a gateway's topology within SmartDashboard but was deleted on the GAiA OS and is therefore not shown via ifconfig. As your command relies on ifconfig this critical information is not reflected.

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Mon, 25 Jun 2018 10:22:33 GMT

ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;more $FWDIR/state/local/FW1/local.set | grep -A 8 %|grep ip| tr \a\d\r\: \ ;echo -n " mask " ;ifconfig % | sed -rn "2s/ .*:(.*)$/\1/p";echo " spoofing networks:";more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq |tr \<\>\:\" \ ;echo " "'

I noticed that the bond interface was not displayed in the old version. Tested it on about 5 firewalls. Everything looks good so far.

For more infos see in this article with revisions:

Show Address Spoofing Networks via CLI

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Mon, 25 Jun 2018 11:36:34 GMT

Command:

I noticed that the vip and ip interface was not displayed in the old version.

Example:

For more infos see in this article with revisions:

Show Address Spoofing Networks via CLI

Re: One-liner for Address Spoofing Troubleshooting

AlekseiShelepov — Mon, 25 Jun 2018 11:52:04 GMT

I hope this will be integrated into CCC.

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Mon, 25 Jun 2018 12:24:00 GMT

And the latest version:

ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;echo -n " VIP "; cphaprob -a if |grep %|grep -v U|grep -v D | cut -c16-| tr -d "\r\n" ;echo;echo -n " IP ";ifconfig % | grep "inet addr" | cut -d ":" -f 2 | cut -d " " -f 1;echo -n " Mask " ;ifconfig % | sed -rn "2s/ .*:(.*)$/\1/p";echo -n " ANTISPOOFING ENABLED: ";more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep has_addr_info | cut -c17- | tr \) " " |sort -ng| uniq ; echo -n " DETECT=true or PREVENT=false: "; more $FWDIR/state/local/FW1/local.set |grep -A 30 "eth5" | grep monitor_only | cut -c16- | tr \) " " |sort -ng| uniq ;echo " ADDRESS SPOOFING NETWORKS:";more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq |tr \<\>\:\" \ ;echo " "'

Now you can see the states off:

- ANTISPOOFING ENABLED

- DETECT=true or PREVENT=false

For more infos see in this article with revisions:

Show Address Spoofing Networks via CLI

Now I need a break. The one-liner make me crazy.

Regards

Heiko

Re: One-liner for Address Spoofing Troubleshooting

Danny — Tue, 26 Jun 2018 02:10:43 GMT

Let's talk about some improvements.

Instead of your beginning:

ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v ":" | grep -v ^lo‍‍

I'd suggest

grep -B1 ifindex $FWDIR/state/local/FW1/local.set | sed -n '1~3p' | cut -c 4- | sort | uniq‍‍

instead to actually reflect the calculated topology from SmartDashboard and not the one that is configured on GAiA OS. Otherwise users will run into issues if the configured interfaces topology in SmartDashboard doesn't match the one ifconfig results.

Furthermore I'd be of help if your One-liner would would return MODE: Detect or Mode: Prevent instead of DETECT=true or PREVENT=false.

I also noticed that your One-liner is currently grepping directly for eth5. This doesn't look correct.

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Tue, 26 Jun 2018 07:01:30 GMT

Hello Danny,

Thanks for the 2500 points. It's a little too much for a one-liner.

I think it's a great community and we should all help each other without rewards.

I gave you back 2500 points for your great work in this article Common Check Point Commands (ccc).

And thanks to everyone who helped to find the great commands for ccc.

Best Regards

Heiko

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Tue, 26 Jun 2018 07:06:18 GMT

Sorry, of course a % must be used instead of eth5.

Here is the right version:

ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;echo -n " VIP "; cphaprob -a if |grep %|grep -v U|grep -v D | cut -c16-| tr -d "\r\n" ;echo;echo -n " IP ";ifconfig % | grep "inet addr" | cut -d ":" -f 2 | cut -d " " -f 1;echo -n " Mask " ;ifconfig % | sed -rn "2s/ .*:(.*)$/\1/p";echo -n " ANTISPOOFING ENABLED: ";more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep has_addr_info | cut -c17- | tr \) " " |sort -ng| uniq ; echo -n " DETECT=true or PREVENT=false: "; more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep monitor_only | cut -c16- | tr \) " " |sort -ng| uniq ;echo " ADDRESS SPOOFING NETWORKS:";more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq |tr \<\>\:\" \ ;echo " "'

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Tue, 26 Jun 2018 12:07:14 GMT

Hi Danny,

I think the "fw ctl zdebug drop" problem is not solvable because there is no interface mapping.

Output from "fw ctl zdebug drop":

;[cpu_1];[fw4_0];fw_log_drop_conn: Packet <dir 1, 1.1.1.2:59655 -> 2.9.2.3:53 IPP 17>, dropped by do_inbound, Reason: Address spoofing;

Regards,

Heiko

Re: One-liner for Address Spoofing Troubleshooting

Kaspars_Zibarts — Wed, 27 Jun 2018 07:31:21 GMT

I'm checking on this if we could utilise some "after" event log fetch from log storage but that would be dependent on spoofing being logged actually. and it would not be that instantaneous

Re: One-liner for Address Spoofing Troubleshooting

Norbert_Bohusch — Wed, 27 Jun 2018 07:37:52 GMT

Heiko Ankenbrand‌: I added to output not false/true but PREVENT/DETECT, but encountered another thing, not considered in your one-liner: VLAN Trunks (phy. IFs are also displayed and with all VLAN VIPs/Spoofing Networks)

Here the altered one-liner and a screenshot with the VLAN trunk issue:

# ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;echo -n " VIP "; cphaprob -a if |grep %|grep -v U|grep -v D | cut -c16-| tr -d "\r\n" ;echo;echo -n " IP ";ifconfig % | grep "inet addr" | cut -d ":" -f 2 | cut -d " " -f 1;echo -n " Mask " ;ifconfig % | sed -rn "2s/ .*:(.*)$/\1/p";echo -en " ANTISPOOFING ENABLED:\t";more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep has_addr_info | cut -c17- | tr \) " " |sort -ng| uniq ; echo -en " ANTISPOOFING MODE:\t"; if [ `more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep monitor_only | cut -c16- | tr \) " " |sort -ng| uniq` ]; then echo "PREVENT"; else echo "DETECT"; fi;echo " ADDRESS SPOOFING NETWORKS:";more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq |tr \<\>\:\" \ ;echo " "'

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Wed, 27 Jun 2018 10:23:39 GMT

Nice!

Had after 4 hours no more nerves to improve the command .

THX,

Heiko

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Wed, 27 Jun 2018 12:24:18 GMT

Hi Norbert,

There is a smal issue in the one-liner. I had add "|grep -o false".

ifconfig -a |grep -B 1 inet |grep encap| awk '{print $1}' | grep -v lo | grep -v ":" | grep -v ^lo | xargs -I % sh -c 'echo %;echo -n " VIP "; cphaprob -a if |grep %|grep -v U|grep -v D | cut -c16-| tr -d "\r\n" ;echo;echo -n " IP ";ifconfig % | grep "inet addr" | cut -d ":" -f 2 | cut -d " " -f 1;echo -n " Mask " ;ifconfig % | sed -rn "2s/ .*:(.*)$/\1/p";echo -en " ANTISPOOFING ENABLED:\t";more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep has_addr_info | cut -c17- | tr \) " " |sort -ng| uniq ; echo -en " ANTISPOOFING MODE:\t"; if [ `more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep monitor_only | cut -c16- | tr \) " " |sort -ng| uniq| grep -o false` ]; then echo "PREVENT"; else echo "DETECT"; fi; echo -en " ANTISPOOFING TOPO:\t"; if [ `more $FWDIR/state/local/FW1/local.set |grep -A 30 % | grep external | cut -c12- | tr \) " " |sort -ng| uniq| grep -o true` ]; then echo "External"; else echo "Internal"; fi;echo " ADDRESS SPOOFING NETWORKS:";more $FWDIR/state/local/FW1/local.set | grep -A 30 %|grep ": (\""|sort -ng| uniq |tr \<\>\:\" \ ;echo " "'

I also added the interface topology setting.

I think this is the longest one-liner in the forum .

For more infos see in this article with revisions:

Show Address Spoofing Networks via CLI

THX,

Heiko

Re: One-liner for Address Spoofing Troubleshooting

HeikoAnkenbrand — Wed, 27 Jun 2018 12:43:52 GMT

We can also add more fields.

:ifindex (3)
:span_port_interface (false)
:has_dir_scan_info (true)
:dir_scan_table (dir_scan_addrs_list4)
:has_addr_info (true)
:addr_table (valid_addrs_list4)
:mgmt_if_id (4)
:activate_mc_enforce (0)
:positive_mc_list (0)
:mc_log (0)
:overlap_nat (false)
:overlap_nat_src_addr ()
:overlap_nat_dst_addr ()
:overlap_nat_netmask (255.255.255.0)
:spooftrack (log)
:monitor_only (false)
:external (true)
:internal_type (undefined)
:access (undefined)
:dmz (false)
:mss_value (0)

I think "spooftrack" is intresting.

Or routing information of the interface

--> netstat -rn | grep <interface>

Do you want other fields?

Regards,

Heiko

Re: One-liner for Address Spoofing Troubleshooting

Danny — Thu, 28 Jun 2018 09:08:39 GMT

My original version is integrated within ccc starting from version 2.5.