Incoming connections to client's IP (192.168.6.1) is established and
seems redirected to lo0:port, but outgoing connection from client's lo0
to a server's IP (192.168.5.1) is blocked according to
# tcpdump -en -i pflog0 output:
...
rule 14/(match) block out on axen0: 127.0.0.1:port > 192.168.5.1:port: S
776927979:776927979(0) ack 896868769 win 16384 <mss...
...
Do I need to add a NAT rule to have reply passed to server's source IP
(192.168.5.1) or what?
Thanks.
Denis
On 5/13/2018 7:12 PM, Johan Hattne wrote:
> Nah, sorry, I misread your rules—on second look, I don’t see what’s gone
> wrong. What about logging blocked packets
>
> block log (all, to pflog0)
>
> in pf.conf and dumping it
>
> # tcpdump -en -i pflog0
>
> while doing what you expect should work?
>
> // Johan
>
>> On May 13, 2018, at 02:15, Denis <den...@mindall.org> wrote:
>>
>> Johan,
>>
>> Do I have to remove these two rules or modify them by removing ipencap?
>>
>> pass in quick on $ipsec_enc_if proto ipencap from any to ($ipsec_if) \
>> keep state (if-bound)
>> pass out quick on $ipsec_enc_if proto ipencap from ($ipsec_if) to any \
>> keep state (if-bound)
>>
>> On 5/12/2018 10:11 AM, Johan Hattne wrote:
>>>
>>>> On May 11, 2018, at 06:21, Denis <den...@mindall.org> wrote:
>>>>
>>>> Hello,
>>>>
>>>> I have working ikev2 tunnel between two virtual aliased subnets. But no
>>>> traffic over IPsec tunnel from $ext_if on server machine to $ext_if on
>>>> client machine and vice-versa. Both machines are using in production and
>>>> firewalled by PF.
>>>>
>>>> ------------------------
>>>> # cat /etc/hostname.em1
>>>> ### server $ext_if
>>>> dhcp
>>>> alias 192.168.5.1
>>>> 255.255.255.0
>>>> ------------------------
>>>> |
>>>> | IPsec
>>>> |
>>>> ------------------------
>>>> # cat /etc/hostname.axen0
>>>> ### client $ext_if
>>>> dhcp
>>>> alias 192.168.6.1
>>>> 255.255.255.0
>>>> ------------------------
>>>>
>>>> I can ping each 'end' of IPsec virtual subnets from both side of tunnel
>>>> (after IP assigned to both gateways by ISP's dhcp), but no traffic though.
>>>>
>>>> server# ping 192.168.6.1
>>>> 64 bytes from 192.168.6.1: icmp_seq=0 ttl=255 time 1.064 ms
>>>> ...
>>>> clielnt# ping 192.168.5.1
>>>> 64 bytes from 192.168.5.1: icmp_seq=0 ttl=255 time 0.785 ms
>>>> ...
>>>>
>>>> The final goal is: All incoming traffic on server's $ext_if = "em1" for
>>>> selected ports 25, 443, 465, 993 etc. must be redirected from aliased
>>>> server's IP:192.168.5.1 though IPsec tunnel to appropriate services on
>>>> aliased client's IP:192.168.6.1. So client can reply to incoming
>>>> connections to remote server's via IPsec lan.
>>>>
>>>> No routing is needed between server's / client's 'real' private LANs.
>>>> Because of that I've decided to use aliased virtual lans for IPsec
>>>> tunneling. But I'm not sure about correctness of this.
>>>>
>>>> server# cat /etc/iked.conf
>>>> gw_ip = "em1"
>>>> local_lan = "192.168.5.0/24" # server side virtual subnet alias to em1 \
>>>> which obtain an address from dhcp
>>>> remote_lan = "192.168.6.0/24" # client virtual subnet alias to axen0 \
>>>> which obtain an address from dhcp too.
>>>> mode = "passive"
>>>>
>>>> ikev2 "pki-srv" $mode ipcomp esp \
>>>> from $local_lan to $remote_lan \
>>>> local $gw_ip peer any \
>>>> srcid srv-pubkey dstid clnt-pubkey \
>>>> tag "srv.tld.ipsec"
>>>> tap "enc0"
>>>>
>>>> server# cat /etc/pf.conf
>>>> ...
>>>> ext_if = em1
>>>> ipsec_if = em1
>>>> ipsec_enc_if = enc0
>>>> ipsec_local_lan = "192.168.5.0/24"
>>>> ipsec_remote_lan = "192.168.6.0/24"
>>>> ...
>>>> queue rootq on $ext_if bandwidth 100M max 100M
>>>> queue ipsec parent rootq bandwidth 90M min 70M max 100M
>>>> queue ipsec_users parent rootq bandwidth 50M min 30M max 60M
>>>> queue bulk parent rootq bandwidth 10M default
>>>> ...
>>>> block on $ext_if all
>>>> block on $ipsec_enc_if all
>>>> ...
>>>>
>>>> # --- IPsec
>>>> pass in quick on $ipsec_if proto udp from any to ($ipsec_if) port \
>>>> {isakmp, ipsec-nat-t}
>>>> pass out quick on $ipsec_if proto udp from ($ipsec_if) to any port \
>>>> {isakmp, ipsec-nat-t} keep state
>>>>
>>>> pass in quick on $ipsec_if proto esp from any to ($ipsec_if)
>>>> pass out quick on $ipsec_if proto exp from ($ipsec_if) to any \
>>>> keep state set queue ipsec
>>>>
>>>> pass out quick on $ipsec_if tagged srv.tld.ipsec set queue ipsec_users
>>>>
>>>> pass in quick on $ipsec_enc_if proto ipencap from any to ($ipsec_if) \
>>>> keep state (if-bound)
>>>> pass out quick on $ipsec_enc_if proto ipencap from ($ipsec_if) to any \
>>>> keep state (if-bound)
>>>>
>>>> pass in quick on $ipsec_enc_if from $ipsec_remote_lan to \
>>>> $ipsec_local_lan keep state (if-bound)
>>>> pass out quick on $ipsec_enc_if from $ipsec_local_lan to \
>>>> $ipsec_remote_lan keep state (if-bound)
>>>> ...
>>>>
>>>>
>>>> client# cat /etc/iked.conf
>>>> gw_ip = "axen0"
>>>> local_lan = "192.168.6.0/24" # clinet virtual subnet alias to axen0 \
>>>> which obtain an address from dhcp
>>>> remote_lan = "192.168.5.0/24" #server side virtual subnet alias to em0 \
>>>> which obtain an address from dhcp
>>>> srv_ip = "a.b.c.d" #server's IP each time is the same from ISP's dhcp
>>>> mode = "active"
>>>>
>>>> ikev2 "pki-clnt" $mode ipcomp esp \
>>>> from $local_lan to $remote_lan \
>>>> local $gw_ip to $srv_ip \
>>>> crcid clnt-pubkey dstid srv-pubkey \
>>>> tag "clnt.tld.ipsec"
>>>> tap "em0"
>>>>
>>>> client# cat /etc/pf.conf
>>>> ...
>>>> ext_if = axen0
>>>> ipsec_if = axen0
>>>> ipsec_enc_if = enc0
>>>> ipsec_local_lan = "192.168.6.0/24"
>>>> ipsec_remote_lan = "192.168.5.0/24"
>>>> ...
>>>> queue rootq on $ext_if bandwidth 100M max 100M
>>>> queue ipsec parent rootq bandwidth 90M min 70M max 100M
>>>> queue ipsec_users parent rootq bandwidth 50M min 30M max 60M
>>>> queue bulk parent rootq bandwidth 10M default
>>>> ...
>>>> block on $ext_if all
>>>> block on $ipsec_enc_if all
>>>> ...
>>>>
>>>> # --- IPsec
>>>> pass in quick on $ipsec_if proto udp from any to ($ipsec_if) port \
>>>> {isakmp, ipsec-nat-t}
>>>> pass out quick on $ipsec_if proto udp from ($ipsec_if) to any port \
>>>> {isakmp, ipsec-nat-t} keep state
>>>>
>>>> pass in quick on $ipsec_if proto esp from any to ($ipsec_if)
>>>> pass out quick on $ipsec_if proto exp from ($ipsec_if) to any \
>>>> keep state set queue ipsec
>>>>
>>>> pass out quick on $ipsec_if tagged clnt.tld.ipsec set queue ipsec_users
>>>>
>>>> pass in quick on $ipsec_enc_if proto ipencap from any to ($ipsec_if) \
>>>> keep state (if-bound)
>>>> pass out quick on $ipsec_enc_if proto ipencap from ($ipsec_if) to any \
>>>> keep state (if-bound)
>>>>
>>>> pass in quick on $ipsec_enc_if from $ipsec_remote_lan to \
>>>> $ipsec_local_lan keep state (if-bound)
>>>> pass out quick on $ipsec_enc_if from $ipsec_local_lan to \
>>>> $ipsec_remote_lan keep state (if-bound)
>>>> ...
>>>>
>>>> I think it can be something wrong in PF configuration or
>>>> missed/unfinished touching IPsec traffic filtering.
>>>>
>>>> Please advice.
>>>
>>> Do you not need a “proto ipencap” on the last two pass-rules that permit
>>> traffic between your LAN:s?
>>>
>>> // Johan
>>>
>>
>
