Cisco-Port-Knocking-EEM-applet

Port Knocking EEM applet

Оригинал: https://davideaves.com/2014/11/cisco-port-knocking-eem/

Это пример плохого решения так как

• permit tcp any any eq 32022 log - попадает в том числе и транзитный траффик, а не только трафик к самому устройству, чего хотелось бы. (сам ACL см ниже)

event manager applet

event manager environment KNOCK_ACL outside-in4
no event manager applet KNOCK
event manager applet KNOCK
 event syslog pattern "%FMANFP-6-IPACCESSLOGP: SIP0: fman_fp_image:  list outside-in4 permitted tcp *"
 action 1.0 regexp "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+" "$_syslog_msg" ADDR
 action 1.1 regexp "\([0-9]+\)," "$_syslog_msg" PORT
 action 1.2 regexp "[0-9]+" "$PORT" PORT
 action 2.0 syslog msg "Received a knock from $ADDR on port $PORT..."
 action 2.1 syslog msg "Adding $ADDR to the $KNOCK_ACL ACL"
 action 3.0 cli command "enable"
 action 3.1 cli command "configure terminal"
 action 3.2 cli command "ip access-list extended $KNOCK_ACL"
 action 3.3 cli command "1 permit tcp host $ADDR any eq 22"
 action 3.4 cli command "2 permit tcp host $ADDR any eq 23"
 action 4.0 wait 60
 action 5.0 syslog msg "Removing $ADDR to the $KNOCK_ACL ACL"
 action 6.0 cli command "no permit tcp host $ADDR any eq 22"
 action 6.1 cli command "no permit tcp host $ADDR any eq 23"
 action 6.2 cli command "exit"
!
exit

ip access-list extended outside-in4

no ip access-list extended outside-in4
ip access-list extended outside-in4
 remark *** KNOCK ***
 permit tcp any any eq 32022 log
 remark *** TRUSTED ***
 permit tcp any any established
 remark *** DENIED ***
 deny   tcp any any
 remark *** PERMITED ***
 permit ip any any

Interface Po2.54

interface Port-channel2.54
 description ---== Uplink ===---
 encapsulation dot1Q 54
 ip address 172.31.0.1 255.255.255.252
 ip nat outside
 ip access-group KNOCK_TCP_32022 in