Hi all,
I've found how to run remote commands on the MikroTik board using SSH and a keyfile. I'm running fail2ban on my server in the DMZ, if someone tries to logon several time he/she is added the the server's iptable and all connections are blocked from the offending IP.
Rather then blocking the hosts in the server's IP Table I would like to use password-less SSH to have fail2ban add the offending IP to an address list on the MikroTik box. This shouldn't be too hard.. However:
Those IP's should not be permanent, is there any method to use the shell to add IP addresses to an address list with a time? I can do this:
/ip firewall address-list add address=x.x.x.x list=remote_evilhosts
What I would like too see:
/ip firewall address-list add address=x.x.x.x list=remote_evilhosts timeout=24h
or:
/ip firewall address-list add address=x.x.x.x list=remote_evilhosts dynamic=24h
Something like that, can it be done?
-
-
pakjebakmeel
newbie
- Posts: 32
- Joined:
[FAIL2BAN] add banned IP's to addr list on remote RouterOS
Last edited by pakjebakmeel on Tue Aug 30, 2011 2:54 pm, edited 1 time in total.
Re: Remote SSH commands
/ip firewall filter gives you action=
add-dst-to-address-list - adds destination address to address-list
add-src-to-address-list - adds source address to address-list
address-list-timeout - specifies timeout address is added to the list.
add-dst-to-address-list - adds destination address to address-list
add-src-to-address-list - adds source address to address-list
address-list-timeout - specifies timeout address is added to the list.
-
-
pakjebakmeel
newbie
- Posts: 32
- Joined:
Re: Remote SSH commands
But then I can only add the source/destination IP based on a firewall rule? I need to add offending IP's from my Gentoo server's fail2ban, but would prefer them to be dynamic. Would there be a solution around this? Would it not make sense to have the ability to add IP's to address-lists with a timeout?
For this fail2ban purpose but also for "setting and forgetting", in case you need to provide access for a period of time and not wanting to forget to remove the entry so you can leave it and it will delete itself >?
For this fail2ban purpose but also for "setting and forgetting", in case you need to provide access for a period of time and not wanting to forget to remove the entry so you can leave it and it will delete itself >?
Re: Remote SSH commands
That is not a current feature. You'll either have to write your code around it and manually delete items, or wait for it to get implemented (which may not happen).Would there be a solution around this? Would it not make sense to have the ability to add IP's to address-lists with a timeout?
Re: Remote SSH commands
Another option would be to use a custom rule on the firewall to trigger an event and add it to the address list.
Use something like Hping3 or scapy to send a custom packet through the router with options you should never see in real traffic (ie, a bogon address, or an invalid ICMP type, obscure or invalid TCP ports/options).
For this example, I am using ICMP 3:9 (DOD Host Prohibited), with a source IP of the attacker and a destination IP of a non-routable address (203.0.113.111 from the IANA example range).Then your write a custom rule in forward to pick up this packet and take some action
The only word of warning is this is for the most part a wide open way to cause the router to block things without authentication. By using a bogon IP as the destination, it prevents anyone from abusing this externally, but it doesn't prevent anyone inside the LAN from spoofing a packet and adding anything they want to the evilhosts list. I would consider implementing some sort of whitelist or safeguard with the use of the remote_evilhosts to prevent known good sources from getting added (and inadvertently getting yourself locked out of the server for 24 hours).
This isn't a perfect solution, but it gets the job done. It's security through obscurity, so be careful with what you use it for. By changing around what options and payloads you are listening for, it can also be turned around and used as a portknocking implementation to grant remote access.
--CC_DKP
Edit: Cleaning up typos.
Use something like Hping3 or scapy to send a custom packet through the router with options you should never see in real traffic (ie, a bogon address, or an invalid ICMP type, obscure or invalid TCP ports/options).
For this example, I am using ICMP 3:9 (DOD Host Prohibited), with a source IP of the attacker and a destination IP of a non-routable address (203.0.113.111 from the IANA example range).
Code: Select all
hping3 -c 1-C 3 -K 9 -a <Attackers IP> 203.0.113.111 Code: Select all
add chain=forward dst-address=203.0.113.111 protocol=icmp icmp-options=3:9 action=add-src-to-address-list address-list-timeout=24h address-list=remote_evilhosts comment="Secret message from server, block for 24h"
add chain=forward dst-address=203.0.113.111 protocol=icmp icmp-options=3:9 action=drop comment="Keep secrets secret"This isn't a perfect solution, but it gets the job done. It's security through obscurity, so be careful with what you use it for. By changing around what options and payloads you are listening for, it can also be turned around and used as a portknocking implementation to grant remote access.
--CC_DKP
Edit: Cleaning up typos.
Last edited by CCDKP on Fri Aug 26, 2011 4:14 pm, edited 1 time in total.
Re: Remote SSH commands
I'm also interested in making a (gentoo, what a coincidence 
) fail2ban server interact with a mikrotik router/firewall.
I see how to add an address to a list, but not how to remove an address from a list. I only see how to remove a whole list.
Basic Idea would not be to use any timeout on mikrotik device (not really standard feature and really unlikely to be implemented) but to rely on fail2ban itself (which handle "ban" and "unban" events: so basically, on each event, triggering a ssh address-list management command on mikrotik firewall). All would be done by a fine fail2ban setup.
BTW, can you rename this thread title please? Like including fail2ban into it please?
) fail2ban server interact with a mikrotik router/firewall.I see how to add an address to a list, but not how to remove an address from a list. I only see how to remove a whole list.
Basic Idea would not be to use any timeout on mikrotik device (not really standard feature and really unlikely to be implemented) but to rely on fail2ban itself (which handle "ban" and "unban" events: so basically, on each event, triggering a ssh address-list management command on mikrotik firewall). All would be done by a fine fail2ban setup.
BTW, can you rename this thread title please? Like including fail2ban into it please?
Re: Remote SSH commands
Well why didn't you say you could have fail2ban run an "unban" event.I see how to add an address to a list, but not how to remove an address from a list. I only see how to remove a whole list.
Basic Idea would not be to use any timeout on mikrotik device (not really standard feature and really unlikely to be implemented) but to rely on fail2ban itself (which handle "ban" and "unban" events: so basically, on each event, triggering a ssh address-list management command on mikrotik firewall). All would be done by a fine fail2ban setup.
Code: Select all
/ip firewall address-list remove [find address=X.X.X.X list=remote_evilhosts]--@CC_DKP
Re: Remote SSH commands
i would go API path and create something along these lines:
router config:
in ip firewall filter there is rule that drops everything from address-list named "ban"
then on your server you create small tool that is capable of RouterOS API and something like sqlite. When you have IP to add to ban list, then through API you can add the address, as return you get .id value of the entry you just added, store that in sql with time when this has to be removed. And then just periodically check for the time outs in the table, when it is reached you already have .id value to remove.
a little hackish solution would be:
router config:
you have 2 firewall rules one that check list - to-ban and other as previously ban. rule that looks in to-ban looks for destination address to be in to-ban list and adds entry in ban list with add-dst-to-address-list where you can set time.
now your API tool creates entry on the router in to-ban list, and sends ICMP packet with required DST address. your firewall will catch it and add it to ban list. You can check from the tool if address is added into ban list by firewall, and then remove address from to-ban list
router config:
in ip firewall filter there is rule that drops everything from address-list named "ban"
then on your server you create small tool that is capable of RouterOS API and something like sqlite. When you have IP to add to ban list, then through API you can add the address, as return you get .id value of the entry you just added, store that in sql with time when this has to be removed. And then just periodically check for the time outs in the table, when it is reached you already have .id value to remove.
a little hackish solution would be:
router config:
you have 2 firewall rules one that check list - to-ban and other as previously ban. rule that looks in to-ban looks for destination address to be in to-ban list and adds entry in ban list with add-dst-to-address-list where you can set time.
now your API tool creates entry on the router in to-ban list, and sends ICMP packet with required DST address. your firewall will catch it and add it to ban list. You can check from the tool if address is added into ban list by firewall, and then remove address from to-ban list
Re: Remote SSH commands
Well, I'm not the OP, I just joined the conversationWell why didn't you say you could have fail2ban run an "unban" event.
Owww, thank you very much, I was looking in /ip firewall filter section...Code: Select all/ip firewall address-list remove [find address=X.X.X.X list=remote_evilhosts]
@janisk: luckily fail2ban already manage all these stuff internally (hosts storage, timers expiring, etc). Heavy artillery shouldn't be necessary in this case
Right. FYI, fail2ban allows "easy" implementation of new service monitorings (well, not new in our case (ssh)) and new "actions" (command to run on events).Optionally, consider having it purge the list every time the server reboots
Are defined following events: actionstart, actionstop, actioncheck, actionban, actionunban.
If flushing when starting/stoping, this should be quite easy doying a proper fail2ban/rOS integration provided I can pass commands to routerboard via ssh (keys auth) without a problem.
Having a global behaviour juste like already written iptables events' actions should be a good start (playing with a single address list instead of a single chain).
I'll look into it when I've some time.
Thanks for your help guys.
-
-
pakjebakmeel
newbie
- Posts: 32
- Joined:
Re: [FAIL2BAN] add banned IP's to addr list on remote Router
That all sounds hopeful. Thanks for the help so far. I hope I can find the time to do some testing with the provided options this weekend.
-
-
pakjebakmeel
newbie
- Posts: 32
- Joined:
Re: [FAIL2BAN] add banned IP's to addr list on remote Router
WHOOHOO!
Success! A quick guide:
1. Get DSA authentication on the MikroTik box: http://wiki.mikrotik.com/wiki/Use_SSH_t ... y_login%29
2. Install Fail2Ban on an internal or DMZ server and configure some jails in jail.conf. Mine looks like this for SSH and FTPS (relevant portion only):
Note that the action is "MikroTik".
3. Create the action file MikroTik.conf:
4. Restart Fail2Ban to load the new config. You can test the command line commands from bash first and check the address list in MikroTik to confirm that the list is actually updated.
When I start or stop the service all IP's on the Fail2Ban address list are purged. When someone fails authentication too much times they are added to the address list and banned. When the unban command runs after an amount of time that you have configured only that IP is removed from the address list.
SWEET!
Success! A quick guide:
1. Get DSA authentication on the MikroTik box: http://wiki.mikrotik.com/wiki/Use_SSH_t ... y_login%29
2. Install Fail2Ban on an internal or DMZ server and configure some jails in jail.conf. Mine looks like this for SSH and FTPS (relevant portion only):
Code: Select all
[ssh-MikroTik]
enabled = true
filter = sshd
action = MikroTik
logpath = /var/log/messages
maxretry = 5
[proftpd-MikroTik]
enabled = true
filter = proftpd
action = MikroTik
logpath = /var/log/messages
maxretry = 5
3. Create the action file MikroTik.conf:
Code: Select all
[Definition]
actionstart = ssh -i PATHTOSSHKEYFILE USER@MIKROTIKBOX "/ip firewall address-list remove [find list=Fail2Ban]"
actionstop = ssh -i PATHTOSSHKEYFILE USER@MIKROTIKBOX "/ip firewall address-list remove [find list=Fail2Ban]"
actioncheck = ""
actionban = ssh -i PATHTOSSHKEYFILE USER@MIKROTIKBOX "/ip firewall address-list add list=Fail2Ban address=<ip> comment=<time>"
actionunban = ssh -i PATHTOSSHKEYFILE USER@MIKROTIKBOX "/ip firewall address-list remove [find address=<ip> list=Fail2Ban]"
When I start or stop the service all IP's on the Fail2Ban address list are purged. When someone fails authentication too much times they are added to the address list and banned. When the unban command runs after an amount of time that you have configured only that IP is removed from the address list.
SWEET!
Re: Remote SSH commands
When all you have is a hammer, everything looks like a nail.
@janisk: luckily fail2ban already manage all these stuff internally (hosts storage, timers expiring, etc). Heavy artillery shouldn't be necessary in this case
-
-
pakjebakmeel
newbie
- Posts: 32
- Joined:
Re: [FAIL2BAN] add banned IP's to addr list on remote Router
This is still working like a charm and I haven't had any issues with it yet. All the records are properly purged over a reboot or deamon restart.
Just FYI.
Just FYI.
Re: [FAIL2BAN] add banned IP's to addr list on remote RouterOS
Hi guys,
if you want to implement a fail2ban interaction with Router OS by API, i have write an action script.
https://github.com/pincioc/fail2ban_mikrotik
It's also include a nagios plugin for monitoring the elements in address-list.
pincio
if you want to implement a fail2ban interaction with Router OS by API, i have write an action script.
https://github.com/pincioc/fail2ban_mikrotik
It's also include a nagios plugin for monitoring the elements in address-list.
pincio
-
-
Sanalturkey
just joined
- Posts: 3
- Joined:
Re: [FAIL2BAN] add banned IP's to addr list on remote RouterOS
Bump
I couldn't solve this problem. Where am I making a mistake.
Thanks.
I couldn't solve this problem. Where am I making a mistake.
Code: Select all
2019-12-04 14:07:59,331 fail2ban.actions [14467]: NOTICE [ssh] Ban 128.199.154.237
2019-12-04 14:07:59,342 fail2ban.utils [14467]: Level 39 7efe001068b0 -- exec: mikrotik "/ip firewall address-list add list=Fail2Ban address=128.199.154.237 comment=1575457678.0"
2019-12-04 14:07:59,342 fail2ban.utils [14467]: ERROR 7efe001068b0 -- stderr: '/usr/bin/mikrotik: line 2: /usr/bin/ssh: Permission denied'
2019-12-04 14:07:59,342 fail2ban.utils [14467]: ERROR 7efe001068b0 -- returned 126
Thanks.
Who is online
Users browsing this forum: No registered users and 32 guests