Bug #3198: IPSEC, when nating to a different size subnet a invalid natting rule is made. - pfSense - pfSense bugtracker

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Bug #3198

closed

IPSEC, when nating to a different size subnet a invalid natting rule is made.

Added by Pi Ba over 11 years ago. Updated about 10 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Category:

IPsec

Target version:

2.2

Start date:

09/14/2013

Due date:

% Done:

100%

Estimated time:

Plus Target Version:

Release Notes:

Affected Version:

2.1

Affected Architecture:

All

Description

IPSEC, when nating to a different size subnet a invalid natting rule is made.

Reproducable with these phase2 settings:
Local: 192.168.1.0/24
NAT/BINAT: 172.16.44.0/28
Remote: 20.0.0.0/24

[ There were error(s) loading the rules: /tmp/rules.debug:66: binat source mask and redirect mask must be the same - The line in question reads [66]: binat on enc0 from 192.168.1.0/24 to 20.0.0.0/24 -> 172.16.44.0/28]

Also a localnet of 0.0.0.0 and natting that to a subnet generates no rule at all..
Also disabled ipsec rules still generate nat rules..

This can be fixed by: https://github.com/pfsense/pfsense/pull/784

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Updated by Josep Pujadas-Jubany over 10 years ago

I confirm this bug for 2.1.4

https://forum.pfsense.org/index.php?topic=78637 (in Spanish)

Difficult to understand how to apply the patch explained at https://github.com/pfsense/pfsense/pull/784

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Updated by Christian Renault over 10 years ago

I have this bug on 2.1.4 and after applying the patch described in https://github.com/pfsense/pfsense/pull/784, I have a segmentation fault on the firewall at boot time.

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Updated by Christian Renault over 10 years ago

Forgot to add that the VPNs work after the patch, binat is perfect, but my firewall is useless.

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Updated by Ermal Luçi over 10 years ago

Status changed from New to Feedback

This should be fixed on 2.2

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Updated by Chris Buechler about 10 years ago

Status changed from Feedback to New
Target version set to 2.2

this is still an issue. That pull request was not the answer though.

It should suffice (for 2.2) to add input validation on vpn_ipsec_phase2.php to require using matching subnet sizes where you're using "network" for NAT/BINAT. Either your subnet size has to match (binat), or you need to NAT to a single IP.

Or - allow mismatched subnet sizes, but skip the binat in that circumstance (then people can still manually configure their NAT via outbound NAT).

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