Unable to get VPN to ping out. Unable to set up ProxyVM as sys-vpn

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setem...@posteo.net

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Nov 28, 2020, 3:26:36 PM11/28/20
to Qubes users
Documentation followed:
http://qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion/doc/vpn/#set-up-a-proxyvm-as-a-vpn-gateway-using-iptables-and-cli-scripts


Notes from a Wyzant tutoring session wherein we tried to get this
working

"Troubleshooting Qubes VPN service.

A remote IP seems to be acquired, but then the VPN immediately resets
(connects to 45.x.x.x.) -- default gateway remains local, but is
unpingalbe.

Firewall rules don't look wrong at first glance (sudo /usr/sbin/iptables
-L -v for more detail though to confirm there's no port matching).

nothing interesting found in /var/log/messages or in journalctl. Openvpn
starts...

The forwarding rules shouldn't come into play until you actually use it
as a proxy."

Someone please help me, I'm fucking screaming here every time I try to
do the right thing following documentation or try to figure out why my
own OS is stopping me from doing basic shit.

Thank you for taking the time to help me so far. Be well.

David Hobach

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Nov 29, 2020, 6:09:23 AM11/29/20
to setem...@posteo.net, Qubes users

On 11/28/20 9:26 PM, setem...@posteo.net wrote:
> Documentation followed: http://qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion/doc/vpn/#set-up-a-proxyvm-as-a-vpn-gateway-using-iptables-and-cli-scripts

> Someone please help me, I'm fucking screaming here every time I try to do the right thing following documentation or try to figure out why my own OS is stopping me from doing basic shit.

Hmmm yes the official Qubes doc on VPN is still overcomplicating things a bit too much and even lacking in some areas.

Here's a simple and probably even better way than the official doc:

1. Set up a network infrastructure such as:

-------- your VPN client VM 1
sys-net -- sys-fw -- sys-vpn -- sys-fw-vpn --|
-------- your VPN client VM 2 etc.

Use `qvm-prefs netvm` and `qvm-prefs provides_network` for that.

2. IMPORTANT: Configure your Qubes Os firewall to only allow traffic from sys-vpn to your VPN provider.
I.e. `qvm-firewall sys-vpn --raw` should show something like
```
action=accept proto=tcp dst4=[VPN IP]/32 dstports=[port]-[port]
```
in the end. Use `qvm-firewall` and not the GUI as the GUI will allow e.g. DNS & pings by default IIRC (you need to remove those GUI rules).

If you leave out this step or get it wrong, VPN leaks may be possible.
For testing purposes you could skip this step and implement it after step 3 though.

3. Inside sys-vpn at `/rw/config/rc.local` (autostart file) start your VPN client, e.g. `openvpn` with whatever config you need.

That's it. No messing with iptables et al required... ^^
(Actually there's one iptables rule that would improve security by 0,01%, but I guess it's not really relevant to 99,9% of users.)

Maybe someone should update the official recommendations.

> Thank you for taking the time to help me so far. Be well.

You too.

David Hobach

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Nov 29, 2020, 6:21:09 AM11/29/20
to setem...@posteo.net, Qubes users
On 11/29/20 12:09 PM, David Hobach wrote:
>
> On 11/28/20 9:26 PM, setem...@posteo.net wrote:
>> Documentation followed: http://qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion/doc/vpn/#set-up-a-proxyvm-as-a-vpn-gateway-using-iptables-and-cli-scripts
>
>> Someone please help me, I'm fucking screaming here every time I try to do the right thing following documentation or try to figure out why my own OS is stopping me from doing basic shit.
>
> Hmmm yes the official Qubes doc on VPN is still overcomplicating things a bit too much and even lacking in some areas.
>
> Here's a simple and probably even better way than the official doc:
>
> 1. Set up a network infrastructure such as:
>
>                                              -------- your VPN client VM 1
> sys-net -- sys-fw -- sys-vpn -- sys-fw-vpn --|
>                                              -------- your VPN client VM 2 etc.
>
> Use `qvm-prefs netvm` and `qvm-prefs provides_network` for that.
>
> 2. IMPORTANT: Configure your Qubes Os firewall to only allow traffic from sys-vpn to your VPN provider.
> I.e. `qvm-firewall sys-vpn --raw` should show something like
> ```
> action=accept proto=tcp dst4=[VPN IP]/32 dstports=[port]-[port]
> ```
> in the end. Use `qvm-firewall` and not the GUI as the GUI will allow e.g. DNS & pings by default IIRC (you need to remove those GUI rules).
>
> If you leave out this step or get it wrong, VPN leaks may be possible.
> For testing purposes you could skip this step and implement it after step 3 though.
>
> 3. Inside sys-vpn at `/rw/config/rc.local` (autostart file) start your VPN client, e.g. `openvpn` with whatever config you need.

P.S.: If DNS doesn't work after step 3, you might have to add the following lines to `/rw/config/rc.local` inside `sys-vpn`:

#[your openvpn stuff here]
echo "nameserver [your DNS server]" > /etc/resolv.conf
/usr/lib/qubes/qubes-setup-dnat-to-ns

> That's it. No messing with iptables et al required... ^^
> (Actually there's one iptables rule that would improve security by 0,01%, but I guess it's not really relevant to 99,9% of users.)
>
> Maybe someone should update the official recommendations.
>
>> Thank you for taking the time to help me so far. Be well.
>
> You too.
>
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roberto re

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Feb 22, 2021, 7:24:46 PMFeb 22
to qubes-users
David, this setup is very interesting and referenced in a reputable source by a developer I trust (here https://groups.google.com/g/qubes-users/c/m8BfvtAV2o8/m/FGlwdHrGAgAJ ).

I can grasp the general concept, but I'm unable to execute the instructions without further guidance.

Do you have a hint for a step by step guide that I may follow to be able to implement this?

Official Qubes docs are surely overcomplicating things, as you say, but being step by step guides those are just the thing that users like me need.

I've looked around but I can't seem to find any up-to-date, uncomplicated step by step guide to get a fail closed, antileak VPN tunnel environment.

Thanks in advance for your support.

Roby

awokd

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Mar 2, 2021, 4:43:52 AMMar 2
to qubes...@googlegroups.com
roberto re:

> I've looked around but I can't seem to find any up-to-date, uncomplicated
> step by step guide to get a fail closed, antileak VPN tunnel environment.

https://github.com/QubesOS-contrib/qubes-tunnel

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Stumpy

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Mar 2, 2021, 12:14:17 PMMar 2
to qubes...@googlegroups.com
On 3/1/21 7:36 PM, 'awokd' via qubes-users wrote:
> roberto re:
>
>> I've looked around but I can't seem to find any up-to-date, uncomplicated
>> step by step guide to get a fail closed, antileak VPN tunnel environment.
>
> https://github.com/QubesOS-contrib/qubes-tunnel
>

Sorry I dont have any words of wisdom, I have literally posted for weeks
actually trying to get a functional VPN, I have gotten it to work using
the iptables cli method, and once using the qubes tunnel method (was
easy the one time it worked for me).

Honestly while there are those who have gotten it going I am thinking
there are bugs or something esp for those who want to use minimal
non-fedora templates... but thats just me.

Best of luck.
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