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Today's Topics:
1. Re: [PATCH 08/11] provider: Toggle IPv6 on the transport of IPv4 VPN
connection
(Jussi Laakkonen)
2. Re: [PATCH 09/11] service: Change IPv6 support if split routing value
changes on IPv4 VPN
(Jussi Laakkonen)
3. Re: [PATCH 09/11] service: Change IPv6 support if split routing value
changes on IPv4 VPN
(David Woodhouse)
----------------------------------------------------------------------
Date: Thu, 8 Apr 2021 11:20:51 +0300
From: Jussi Laakkonen <jussi.laakko...@jolla.com>
Subject: Re: [PATCH 08/11] provider: Toggle IPv6 on the transport of
IPv4 VPN connection
To: Daniel Wagner <w...@monom.org>
Cc: connman@lists.01.org
Message-ID: <b9a12aa4-8ab3-e27a-84cb-ed66f15c2...@jolla.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi Daniel,
On 4/6/21 9:42 PM, Daniel Wagner wrote:
> Hi Jussi,
>
>
>> There is a check for split routing of the VPN, the
>> change is not done if the VPN is not going to be the default, i.e., split
>> routing is true. But I guess you weren't after this.
>
> My setup is actually a splitted IPv4/IPv6 VPN tunnel which is not the
> default route.
>
I slept on it and actually, since there is the possibility to stack VPNs
the disabling of IPv6 on the provider should also check if the transport
of the VPN in question is also a VPN and to skip disabling of IPv6 in
that case. For me that sounds ok way to do it as in such case there
would be no point in disabling IPv6 as another VPN can then handle the
IPv6 traffic, which is presumably encrypted and protected.
The transport is already used there, so it is just a bit of
code-juggling (moving).
Cheers,
Jussi
------------------------------
Date: Thu, 8 Apr 2021 11:35:39 +0300
From: Jussi Laakkonen <jussi.laakko...@jolla.com>
Subject: Re: [PATCH 09/11] service: Change IPv6 support if split
routing value changes on IPv4 VPN
To: David Woodhouse <dw...@infradead.org>, connman@lists.01.org
Message-ID: <fd6d30b7-f49e-0c2a-c041-fab387973...@jolla.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi David,
On 4/6/21 11:34 AM, David Woodhouse wrote:
> On Thu, 2021-04-01 at 17:46 +0300, Jussi Laakkonen wrote:
>> Enable/disable IPv6 on VPNs transport when the split routing value is
>> changed. This is important in both cases when a connected IPv4 VPN has
>> the value changed as with split routing -> non-split routing IPv6 should
>> be disabled as well as non-split-routing -> split routed IPv6 should be
>> re-enabled.
>
> Not necessarily. In the Cisco AnyConnect protocol there's a separate
> flag to indicate whether IPv6 should be blocked or not, even when the
> VPN does take the default Legacy IP route.
>
> Surely this should be just part of the routing information that the
> protocol-specific VPN provider itself passes back to ConnMan? It just
> needs a way to request a default IPv6 'unreachable' route?
>
> Likewise, if a VPN is IPv6-only it *might* or might not want to add a
> default Legacy IP 'unreachable' route.
Actually this is already dealt with in the PATCH 08/11. Disabling of
IPv6 depends on the disable_ipv6 value, that is utilized and retrieved
via __connman_ipconfig_ipv6_is_enabled(), and disable_ipv6 value is also
affected by the IPv6 ipconfig method, so when it is set to be
CONNMAN_IPCONFIG_METHOD_OFF then disable_ipv6 will become 1. If the VPN
config keeps the IPv6 ipconfig in any other state, then disabling of
IPv6 is not done.
Only thing is that puzzles me is that does ConnMan support VPNs to
enable a specific ipconfig type while connected?
>
> Just expose that facility from core ConnMan and let the VPN providers
> use it as they desire.
>
I thought of a simple way to avoid adding a new value to the config
files, anyways it would be more of service.c config to be added to the
vpn_*/settings. As there are the set/get for vpn_provider.c booleans it
might be the most straightforward way to have it as run-time only value
that depends on the actual VPN setting, so in case of OpenConnect I
could just add simple follow on its disable IPv6 value (not sure where
to apply that on WireGuard, though... Daniel?).
So in a nutshell:
- vpn_provider.c has a boolean with key "PreventIPv6Leak", accessible
by the VPN plugins via vpn_provider_{set,get}_boolean().
- Each plugin can then be amended with the call to set the value for
the "PreventIPv6Leak"
- When changed, simply send a PropertyChanged signal that is listened
by the connmand VPN plugin (plugins/vpn.c)
- By default the boolean in provider.c on connmand side is set as on
to indicate that IPv6 disabling is done by default, but with that signal
vpn.c does change the value according to the VPN plugins' preference
based usually on user selection.
I see that as a option that is to be set by the actual VPN
configuration, so later on when OpenVPN, for instance, gets IPv6 support
enabled it should set the value accordingly to user preference.
But keep in mind that even though the "PreventIPv6Leak" is on by default
whenever there is an IPv6 ipconfig enabled on the VPN acting as default
route disabling of IPv6 is not done.
Cheers,
Jussi
------------------------------
Date: Thu, 08 Apr 2021 10:20:39 +0100
From: David Woodhouse <dw...@infradead.org>
Subject: Re: [PATCH 09/11] service: Change IPv6 support if split
routing value changes on IPv4 VPN
To: Jussi Laakkonen <jussi.laakko...@jolla.com>, connman@lists.01.org
Message-ID:
<2258a7f0e4dfee8bf788628fb29e04c5a6fb4a58.ca...@infradead.org>
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On Thu, 2021-04-08 at 11:35 +0300, Jussi Laakkonen wrote:
> So in a nutshell:
> - vpn_provider.c has a boolean with key "PreventIPv6Leak", accessible=
=20
> by the VPN plugins via vpn_provider_{set,get}_boolean().
> - Each plugin can then be amended with the call to set the value for=
=20
> the "PreventIPv6Leak"
> - When changed, simply send a PropertyChanged signal that is listened=
=20
> by the connmand VPN plugin (plugins/vpn.c)
> - By default the boolean in provider.c on connmand side is set as on=
=20
> to indicate that IPv6 disabling is done by default, but with that signal=
=20
> vpn.c does change the value according to the VPN plugins' preference=20
> based usually on user selection.
I'd suggest not calling it 'PreventIPv6Leak'. We need to prevent a leak
to *any* unconfigured protocol, be it IPv6 or Legacy IP.
Sure, the most common case these days might be a VPN that provides only
Legacy IP traffic and wants to block the client from using local IPv6,
but it's also *perfectly* feasible that a VPN could provide only IPv6
and want to block Legacy IP.
Remember, the blocker to "IPv6 everywhere" has been deployment to
crappy end-user networks, random airports and hotels etc. =E2=80=94 none of
which matters when the client already established a VPN back to the
"home" network. So a VPN which provides only IPv6 isn't even that
unlikely. It wouldn't surprise me if Facebook are already doing it;
isn't their network purely IPv6 internally, with proxying/NAT for
incoming connections from the 1980s?
Don't build asymmetric assumptions into the core of ConnMan. Make it
capable of blocking Legacy IP when the VPN has only IPv6 as well.
And don't forget to cope with the case of connecting *over* IPv6 to a
Legacy-only VPN, and vice versa. You want to block everything in the
unconfigured protocol *except* the actual VPN gateway in that case.
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