Blocking SSH - Firewall Rule Troubles - SOLVED

johnpoz

And you mention you see stuff in the logs for attempted auth.. And what IP are they authing too?

If that is the IP I can validate if ssh is open to the public.

tha_toadman

That's what I had done originally…

I did the same. My rules don't seem to work after I enable the SSH server via the checkbox.

Floating:
block IPv4 TCP/UDP * 22 (SSH) WAN address 22 (SSH) * none

WAN:
block IPv4 TCP/UDP * 22 (SSH) WAN address 22 (SSH) * none

acherman

I just added the rules again and changed the port back to default 22. You can try to SSH to 64.141.125.250, .251 or .254 (CARP).

tha_toadman

I just added the rules again and changed the port back to default 22. You can try to SSH to 64.141.125.250, .251 or .254 (CARP).

They are all open. Sounds like your rules aren't working either.

johnpoz

Source is not going to be 22 source could be ANY, and ssh is not UDP..

And yes that is open!! on the 250, 251 and 254

login as:

Password for admin@router1.morad:

251 shows
steve.morad

tha_toadman

Ah, yep. Good point. I'll make the change and try again.

johnpoz

dude you should not have to put in any rules.. There is a default DENY!! Are you allowing traffic in like the OP?

if your going to block it has to be above your allow rule - post your rules.

If you have an allow for that segment, then above it put in a block to those specific addresses.

acherman

For me, I pretty much never put in a source port. As others have said, they are usually random, so no point. And also, I put them right at the top - since they are handled from the top down, start with the most specific and go from there.

acherman

My DMZ, or Public routed interface rules look like this now…

johnpoz

so anherman - are you rules in place to block it then? Cuz they are still open. 2 all 3 IPs.

So you have a 1:1 nat setup or something? Or your just routing the traffic?

acherman

Yup, those rules are active. No, no 1:1 set up at all. I do have some inbound stuff set up, but specific ports like 21, 80, 443, etc. Although I do have a couple that I have all ports forwarded to 3 customer devices, just because I don't know what ports they use - those are the ones noted in the middle of the WAN rules (noted as BCM access). But those are other IPs. Dumb question, how can I see what IP's they are trying to get authed on? My pfflowd packages aren't working, so I'm not sure how to look.

tha_toadman

For me, I pretty much never put in a source port. As others have said, they are usually random, so no point. And also, I put them right at the top - since they are handled from the top down, start with the most specific and go from there.

Yeah it was towards the end of the day when I put that original rule in. I've since modified it to read as:

block IPv4 TCP * * WAN address 22 (SSH) * none

I've corrected both the Floating and the WAN but I'm still telling you, SSH is open. The default deny isn't working in this case. Once that SSH server is enabled, it's WAN accessible on my box.

My top 3 rules on the WAN tab (apologies on the formatting):

block * Reserved/not assigned by IANA * * * * * * Block bogon networks
block * Private_Networks * * * * none (custom rule)
block IPv4 TCP * * WAN address 22 (SSH) * none Block SSH remote access

I don't have any 1:1 going either.

johnpoz

ok heres another thing - once you create the rules to block. You have to kill the states.. So for example got in.. You need to kill all the states from my IP, or flush them all. Or have to wait til they expire.

acherman

I actually added the rules, and then I turned SSH on and back to 22. Would that have not allowed the states to begin with? Or no?

johnpoz

no that would not have flushed the states in the firewall. That just tells the box to listen or not listen.

acherman

Okay, I just reset all states - that should confuse some people. I will watch the logs now…

johnpoz

so you do understand its not just ssh that is open

pfsenseopentopublic.png_thumb

johnpoz

If you PM a login - I would be happy to take a look to what is going on.

And ssh is still open.. If you flushed the states.. You go something major issue here.. Either your rules are not being applied or you have something that in front of it allowing it.

pfctl -sa

Lets take a look at the rules..

acherman

PM sent. Thanks John.

Just joking. Apparently I hit the email button instead.

Derelict

I don't even know where to start with what's wrong with your rules. You might want to start over.

Of course everything is open. You are connecting to something on PUBLIC net. He has pass any any rules for that subnet from WAN1/WAN2.